SiteOne Crawler Report - dart.dev

Summary

Website Quality Score

7.0 Good

Performance

10.0

SEO

7.2

Security

6.5

Accessibility

5.0

Best Practices

6.1

⛔ Skipped URLs - 819 skipped URLs found.
⛔ Redirects - 21 redirects found.
⛔ 1 page(s) without <h1> heading.
⛔ Security - 121 pages(s) with critical finding(s).
⚠️ 121 page(s) do not support Brotli compression.
⚠️ No WebP image found on the website.
⚠️ No AVIF image found on the website.
⚠️ 122 page(s) with large inline SVGs (> 5120 bytes).
⚠️ 21 page(s) with skipped heading levels.
⚠️ 2 page(s) with non-clickable (non-interactive) phone numbers.
⚠️ 121 page(s) without form labels.
⚠️ 121 page(s) without aria labels.
⚠️ 121 page(s) without role attributes.
⏩ Loaded robots.txt for domain 'dart.dev': status code 200, size 63 B and took 79 ms.
⏩ External URLs - 819 external URL(s) found.
⏩ DNS IPv6: domain dart.dev does not support IPv6 (DNS server: 127.0.0.53).
✅ 404 OK - all pages exists, no non-existent pages found.
✅ SSL/TLS certificate is valid until Jun 4 06:31:18 2026 GMT. Issued by C = US, O = Google Trust Services, CN = WR3. Subject is CN = dart.dev.
✅ SSL/TLS certificate issued by 'C = US, O = Google Trust Services, CN = WR3'.
✅ Performance OK - all non-media URLs are faster than 3 seconds.
✅ HTTP headers - found 20 unique headers.
✅ All 120 unique title(s) are within the allowed 10% duplicity. Highest duplicity title has 1%.
✅ All 116 description(s) are within the allowed 10% duplicity. Highest duplicity description has 4%.
✅ All pages have quoted attributes.
✅ All pages have inline SVGs with less than 5 duplicates.
✅ All pages have valid or none inline SVGs.
✅ All pages without multiple <h1> headings.
✅ All pages have DOM depth less than 30.
✅ All pages have valid HTML.
✅ All pages have image alt attributes.
✅ All pages have lang attribute.
✅ DNS IPv4 OK: domain dart.dev resolved to 199.36.158.100 (DNS server: 127.0.0.53).

Visited URLs

Found 143 row(s).

URL	Status	Type	Time (s)	Size	Cache
/guides	301	Redirect	8 ms	75 B	None
/docs	200	HTML	10 ms	76 kB	60 min
/libraries/dart-convert	200	HTML	130 ms	123 kB	60 min
/community	200	HTML	123 ms	83 kB	60 min
/language/dot-shorthands	200	HTML	177 ms	179 kB	60 min
/resources/dart-3-migration	200	HTML	148 ms	153 kB	60 min
/null-safety	200	HTML	151 ms	85 kB	60 min
/security	200	HTML	169 ms	85 kB	60 min
/language/async	200	HTML	120 ms	112 kB	60 min
/interop/js-interop	200	HTML	134 ms	81 kB	60 min
/overview	200	HTML	10 ms	96 kB	60 min
/language/classes	200	HTML	147 ms	179 kB	60 min
/libraries/dart-core	200	HTML	164 ms	417 kB	60 min
/terms	200	HTML	135 ms	76 kB	60 min
/language/enums	200	HTML	125 ms	119 kB	60 min
/language/branches	200	HTML	235 ms	151 kB	60 min
/language/generics	200	HTML	9 ms	146 kB	60 min
/web/wasm	200	HTML	166 ms	86 kB	60 min
/language/functions	200	HTML	9 ms	247 kB	60 min
/web	200	HTML	165 ms	76 kB	60 min
/language/mixins	200	HTML	131 ms	133 kB	60 min
/libraries/async/async-await	200	HTML	10 ms	188 kB	60 min
/language/pattern-types	200	HTML	162 ms	193 kB	60 min
/interop/c-interop	200	HTML	161 ms	128 kB	60 min
/libraries	200	HTML	9 ms	98 kB	60 min
/interop/js-interop/package-web	200	HTML	172 ms	166 kB	60 min
/language	200	HTML	10 ms	222 kB	60 min
/web/get-started	200	HTML	161 ms	115 kB	60 min
/language/extension-methods	200	HTML	117 ms	144 kB	60 min
/	200	HTML	10 ms	79 kB	60 min
/libraries/core/environment-declarations	200	HTML	139 ms	104 kB	60 min
/language/error-handling	200	HTML	11 ms	128 kB	60 min
/interop/js-interop/js-types	200	HTML	170 ms	131 kB	60 min
/language/type-system	200	HTML	10 ms	222 kB	60 min
/changelog	200	HTML	175 ms	770 kB	60 min
/language/built-in-types	200	HTML	79 ms	161 kB	60 min
/web/libraries	200	HTML	150 ms	79 kB	60 min
/resources/glossary	200	HTML	184 ms	399 kB	60 min
/language/extension-types	200	HTML	190 ms	202 kB	60 min
/resources/language/number-representation	200	HTML	148 ms	109 kB	60 min
/libraries/async/creating-streams	200	HTML	162 ms	181 kB	60 min
/language/class-modifiers-for-apis	200	HTML	135 ms	128 kB	60 min
/resources/whats-new	200	HTML	157 ms	190 kB	60 min
/language/concurrency	200	HTML	139 ms	156 kB	60 min
/language/records	200	HTML	21 ms	188 kB	60 min
/language/loops	200	HTML	159 ms	173 kB	60 min
/language/libraries	200	HTML	126 ms	105 kB	60 min
/effective-dart/documentation	200	HTML	43 ms	194 kB	60 min
/language/class-modifiers	200	HTML	9 ms	141 kB	60 min
/effective-dart/design	200	HTML	11 ms	520 kB	60 min
/learn	200	HTML	15 ms	79 kB	60 min
/server	200	HTML	143 ms	81 kB	60 min
/interop/js-interop/past-js-interop	200	HTML	118 ms	94 kB	60 min
/interop/js-interop/usage	200	HTML	160 ms	193 kB	60 min
/resources/language/spec	200	HTML	133 ms	82 kB	60 min
/libraries/dart-async	200	HTML	125 ms	209 kB	60 min
/language/extend	200	HTML	134 ms	99 kB	60 min
/libraries/collections/iterables	200	HTML	204 ms	206 kB	60 min
/resources/books	200	HTML	156 ms	83 kB	60 min
/language/constructors	200	HTML	12 ms	207 kB	60 min
/resources/videos	200	HTML	153 ms	80 kB	60 min
/server/google-cloud	200	HTML	122 ms	85 kB	60 min
/language/typedefs	200	HTML	123 ms	91 kB	60 min
/get-dart	200	HTML	10 ms	129 kB	60 min
/libraries/async/futures-error-handling	200	HTML	151 ms	205 kB	60 min
/web/debugging	200	HTML	132 ms	102 kB	60 min
/language/collections	200	HTML	168 ms	286 kB	60 min
/server/fetch-data	200	HTML	157 ms	191 kB	60 min
/language/modifier-reference	200	HTML	113 ms	88 kB	60 min
/libraries/async/using-streams	200	HTML	156 ms	204 kB	60 min
/language/versioning	200	HTML	122 ms	91 kB	60 min
/libraries/dart-math	200	HTML	158 ms	102 kB	60 min
/language/keywords	200	HTML	126 ms	85 kB	60 min
/libraries/serialization/json	200	HTML	161 ms	79 kB	60 min
/effective-dart/usage	200	HTML	140 ms	557 kB	60 min
/language/callable-objects	200	HTML	193 ms	78 kB	60 min
/language/variables	200	HTML	10 ms	147 kB	60 min
/language/isolates	200	HTML	155 ms	374 kB	60 min
/language/operators	200	HTML	10 ms	208 kB	60 min
/language/comments	200	HTML	9 ms	93 kB	60 min
/effective-dart	200	HTML	10 ms	127 kB	60 min
/interop/objective-c-interop	200	HTML	155 ms	216 kB	60 min
/null-safety/understanding-null-safety	200	HTML	137 ms	387 kB	60 min
/server/libraries	200	HTML	128 ms	85 kB	60 min
/web/deployment	200	HTML	140 ms	87 kB	60 min
/resources/useful-packages	200	HTML	145 ms	92 kB	60 min
/interop/java-interop	200	HTML	145 ms	99 kB	60 min
/multiplatform-apps	200	HTML	134 ms	76 kB	60 min
/language/patterns	200	HTML	131 ms	190 kB	60 min
/effective-dart/style	200	HTML	161 ms	192 kB	60 min
/interop/js-interop/tutorials	200	HTML	140 ms	78 kB	60 min
/language/methods	200	HTML	161 ms	124 kB	60 min
/libraries/dart-io	200	HTML	111 ms	150 kB	60 min
/resources/google-apis	200	HTML	155 ms	81 kB	60 min
/learn/tutorial	200	HTML	184 ms	53 kB	60 min
/language/metadata	200	HTML	9 ms	102 kB	60 min
/search	200	HTML	144 ms	74 kB	60 min
/resources/dart-cheatsheet	200	HTML	155 ms	377 kB	60 min
/resources/language/evolution	200	HTML	127 ms	198 kB	60 min
/resources	200	HTML	164 ms	76 kB	60 min
/interop/js-interop/start	200	HTML	137 ms	138 kB	60 min
/interop	200	HTML	163 ms	77 kB	60 min
/interop/js-interop/mock	200	HTML	163 ms	109 kB	60 min
/brand	200	HTML	144 ms	87 kB	60 min
/interop/js-interop/package-web/	301	Redirect	101 ms	127 B	None
/interop/js-interop/	301	Redirect	104 ms	103 B	None
/libraries/async	301	Redirect	83 ms	107 B	None
/libraries/async/zones	200	HTML	142 ms	253 kB	60 min
/language/generics/	301	Redirect	98 ms	101 B	None
/go/next-gen-js-interop	301	Redirect	80 ms	103 B	None
/libraries/dart-html	200	HTML	202 ms	177 kB	60 min
/interop/c-interop/	301	Redirect	155 ms	101 B	None
/articles/libraries/zones	301	Redirect	73 ms	109 B	None
/resources/language	301	Redirect	81 ms	83 B	None
/web/libraries/	301	Redirect	110 ms	93 B	None
/jobs	301	Redirect	79 ms	123 B	None
/language/patterns/	301	Redirect	105 ms	101 B	None
/effective-dart/usage/	301	Redirect	112 ms	107 B	None
/language/operators/	301	Redirect	113 ms	103 B	None
/language/constructors/	301	Redirect	108 ms	109 B	None
/language/pattern-types/	301	Redirect	95 ms	111 B	None
/language/records/	301	Redirect	103 ms	99 B	None
/interop/js-interop/js-types/	301	Redirect	90 ms	121 B	None
/resources/breaking-changes	200	HTML	161 ms	231 kB	60 min
/get-dart/archive	200	HTML	123 ms	93 kB	60 min
/to/spec-draft	301	Redirect	85 ms	207 B	None
/resources/dart-team-packages	200	HTML	185 ms	78 kB	60 min
/language/loops/	301	Redirect	99 ms	95 B	None
/learn/tutorial/advanced-oop	200	HTML	171 ms	169 kB	60 min
/learn/tutorial/data-and-json	200	HTML	165 ms	199 kB	60 min
/learn/tutorial/first-app	200	HTML	8 ms	87 kB	60 min
/learn/tutorial/logging	200	HTML	157 ms	261 kB	60 min
/learn/tutorial/fetch-data	200	HTML	136 ms	156 kB	60 min
/learn/tutorial/object-oriented	200	HTML	147 ms	210 kB	60 min
/learn/tutorial/cli-polish	200	HTML	130 ms	129 kB	60 min
/learn/tutorial/testing	200	HTML	138 ms	187 kB	60 min
/learn/tutorial/interactivity	200	HTML	11 ms	147 kB	60 min
/learn/tutorial/error-handling	200	HTML	158 ms	167 kB	60 min
/learn/tutorial/async	200	HTML	10 ms	151 kB	60 min
/learn/tutorial/packages-libs	200	HTML	158 ms	115 kB	60 min
/search-all	200	HTML	151 ms	75 kB	60 min
https://docs.flutter.dev/jobs	200	HTML	114 ms	120 kB	60 min
/resources/dart-3-migration/	301	Redirect	91 ms	119 B	None
No rows found, please edit your search term.

(+) Show entire table

Best practices

Found 11 row(s).

Analysis name	OK	Notice	Warning	Critical
Duplicate inline SVGs (> 5 and > 1024 B)	13	0	0	0
Heading structure	222	0	21	0
Invalid inline SVGs	13	0	0	0
Large inline SVGs (> 5120 B)	11	0	2	0
Non-clickable phone numbers	0	0	2	0
DOM depth (> 30)	122	0	0	0
Title uniqueness (> 10%)	120	0	0	0
Description uniqueness (> 10%)	116	0	0	0
Brotli support	0	0	121	0
WebP support	0	0	1	0
AVIF support	0	0	1	0
No rows found, please edit your search term.

Large inline SVGs

Severity	Occurs	Detail	Affected URLs (max 5)
warning	244	<svg fill="none" viewBox="0 0 106 40" width="106px" height="40px"> ...	URL 1, URL 2, URL 3, URL 4, URL 5

Duplicate inline SVGs

No problems found.

Invalid inline SVGs

No problems found.

Missing quotes on attributes

No problems found.

DOM depth

No problems found.

Heading structure

Severity	Occurs	Detail	Affected URLs (max 5)
critical	1	No <h1> tag found in the HTML content.	/
warning	14	Heading structure is skipping levels: found an <h3> after an <h1>.	URL 1, URL 2, URL 3, URL 4, URL 5
warning	6	Heading structure is skipping levels: found an <h4> after an <h2>.	URL 1, URL 2, URL 3, URL 4, URL 5
warning	1	Heading structure is skipping levels: found an <h4> after an <h1>.	/language/pattern-types
warning	1	Heading structure is skipping levels: found an <h2> without a previous higher heading.	/

Non-clickable phone numbers

Severity	Occurs	Detail	Affected URLs (max 5)
warning	1	415-555-0100	/language/operators
warning	1	+------------	/null-safety/understanding-null-safety

Title uniqueness

No problems found.

Description uniqueness

No problems found.

Accessibility

Analysis name	OK	Warning	Critical
Missing aria labels	1220	107	10
Missing form labels	0	3	0
Missing roles	0	12	0
Missing image alt attributes	53	0	0
Missing html lang attribute	1	0	0

Valid HTML

No problems found.

Missing image alt attributes

No problems found.

Missing form labels

Severity	Occurs	Detail	Affected URLs (max 5)
warning	121	<input class="search-" id="q" name="q" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<input class="site-* search-" id="search-side" name="q" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	2	<input ***>	URL 1, URL 2

Missing aria labels

Found 96 row(s).

Severity	Occurs	Detail	Affected URLs (max 5)
critical	1	<input id="filter-fixed" name="filter-fixed" *** >	/changelog
critical	1	<input id="filter-removed" name="filter-removed" *** >	/changelog
critical	1	<input id="filter-experimental" name="filter-experimental" *** >	/changelog
critical	1	<input id="open-filter-toggle" *** >	/changelog
critical	1	<input id="filter-deprecated" name="filter-deprecated" *** >	/changelog
critical	1	<select id="stable-versions">	/get-dart/archive
critical	1	<input id="filter-changed" name="filter-changed" *** >	/changelog
critical	1	<input id="filter-new" name="filter-new" *** >	/changelog
critical	1	<input id="filter-versioned" name="filter-versioned" *** >	/changelog
critical	1	<select id="dev-versions">	/get-dart/archive
critical	1	<input id="filter-breaking" name="filter-breaking" *** >	/changelog
critical	1	<select id="stable-os">	/get-dart/archive
critical	1	<select id="beta-versions">	/get-dart/archive
critical	1	<select id="dev-os">	/get-dart/archive
critical	1	<select id="beta-os">	/get-dart/archive
warning	17121	<a class="nav-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	6372	<a ***>	URL 1, URL 2, URL 3, URL 4, URL 5
warning	2881	<button class="nav-* collapsible collapsed" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	1459	<button class="text-* icon-* copy-* hidden" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	698	<a class="text-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	361	<button class="dropdown-* text-* icon-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	333	<a class="nav-* active" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	324	<button class="nav-* collapsible" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	240	<button class="text-* icon-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	143	<button class="nav-* active collapsible" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<a class="jaspr-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<a class="brand" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<a class="filled-" id="skip-to-main" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<button class="filled-*">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	120	<button class="text-*">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	117	<a class="filled-" ** >	/resources/glossary
warning	89	<a id="return-to-top" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	61	<a class="next" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	59	<a class="prev" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	32	<a class="card filled-" ** >	URL 1, URL 2, URL 3, URL 4
warning	12	<button class="filled-* quiz-* secondary" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	12	<a class="tooltip-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	12	<button class="filled-* quiz-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	6	<a class="lite-" ** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	2	<a class="outlined-" ** >	/learn
warning	1	<a id="the-main-function" *** >	/language/functions
warning	1	<a id="default-parameters">	/language/functions
warning	1	<button class="text-* icon-* close-*">	/changelog
warning	1	<a id="do-name-libraries-and-source-files-using-lowercase_with_underscores">	/effective-dart/style
warning	1	<a id="1-provide-an-extended-interface-to-an-existing-type" *** >	/language/extension-types
warning	1	<a id="do-use-curly-braces-for-all-flow-control-structures">	/effective-dart/style
warning	1	<a id="native-assets" *** >	/interop/c-interop
warning	1	<a id="switch">	/language/branches
warning	1	<button class="text-* icon-* info-" ** >	/changelog
warning	1	<a id="prefer-starting-function-or-method-comments-with-third-person-verbs" *** >	/effective-dart/documentation
warning	1	<a id="exporting-dart-functions-and-objects-to-js" *** >	/interop/js-interop/usage
warning	1	<a id="control-flow-operators" *** >	/language/collections
warning	1	<a class="filled-* large-" ** >	/web
warning	1	<a id="prefer-using-_-__-etc-for-unused-callback-parameters" *** >	/effective-dart/style
warning	1	<a id="where-to-learn-more" *** >	/null-safety
warning	1	<a id="spread-operators" *** >	/language/collections
warning	1	<a id="creating-variables" *** >	/null-safety
warning	1	<a id="optional-named-parameters">	/resources/dart-cheatsheet
warning	1	<a id="per-library-language-version-selection" *** >	/resources/language/evolution
warning	1	<a id="do-use-mixin-to-define-a-mixin-type" *** >	/effective-dart/design
warning	1	<a id="do-document-if-your-class-supports-being-used-as-an-interface" *** >	/effective-dart/design
warning	1	<a id="web">	/language/concurrency
warning	1	<a id="digit-separators">	/language/built-in-types
warning	1	<a id="do-document-if-your-class-supports-being-extended" *** >	/effective-dart/design
warning	1	<a id="avoid-lines-longer-than-80-characters">	/effective-dart/style
warning	1	<a name="use-proper-param-types">	/language/type-system
warning	1	<a id="introduction-through-examples" *** >	/null-safety
warning	1	<a class="debian-" ** >	/get-dart
warning	1	<a id="the-sealed-modifer">	/language/class-modifiers-for-apis
warning	1	<a id="pattern-uses">	/language/patterns
warning	1	<a name="operators">	/language/operators
warning	1	<a class="nav-" id="2-tab" ** >	/get-dart
warning	1	<a id="string-interpolation">	/language/built-in-types
warning	1	<a id="enable-null-safety" *** >	/null-safety
warning	1	<a id="2-provide-a-different-interface-to-an-existing-type" *** >	/language/extension-types
warning	1	<a class="nav-" id="1-tab" ** >	/get-dart
warning	1	<a id="trailing-comma">	/language/collections
warning	1	<a id="transparency" *** >	/language/extension-types
warning	1	<button class="text-" ** >	/changelog
warning	1	<a id="null-assertion-operator" *** >	/null-safety/understanding-null-safety
warning	1	<a class="frontanchor" id="try-dart" *** >	/
warning	1	<a id="dart-3-and-null-safety" *** >	/null-safety
warning	1	<button class="text-* icon-* show-*">	/changelog
warning	1	<a id="covariant-keyword" *** >	/language/type-system
warning	1	<a id="non-null-assertion-operator" *** >	/null-safety/understanding-null-safety
warning	1	<a class="nav-* active" id="0-tab" *** >	/get-dart
warning	1	<a id="next-generation-js-interop" *** >	/interop/js-interop
warning	1	<a id="prefer-using--to-convert-null-to-a-boolean-value">	/effective-dart/usage
warning	1	<a id="or-pattern-switch">	/language/patterns
warning	1	<a id="language-version-numbers" *** >	/resources/language/evolution
warning	1	<a id="avoid-mixing-in-a-class-that-isnt-intended-to-be-a-mixin" *** >	/effective-dart/design
warning	1	<a name="use-proper-return-types">	/language/type-system
warning	1	<a id="deprecated-features" *** >	/interop/js-interop
warning	1	<a id="switch-share">	/language/branches
warning	1	<a id="when">	/language/branches
warning	1	<a id="collection-operators" *** >	/language/collections
No rows found, please edit your search term.

(+) Show entire table

Missing roles

Found 13 row(s).

Severity	Occurs	Detail	Affected URLs (max 5)
warning	171	<aside class="alert alert-*">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<nav class="navbar">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<header class="always-*" id="site-header">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	<footer id="page-footer" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	120	<main id="page-content">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	120	<header class="wrap" id="site-content-title">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	113	<header>	URL 1, URL 2, URL 3, URL 4, URL 5
warning	106	<nav class="breadcrumbs" *** >	URL 1, URL 2, URL 3, URL 4, URL 5
warning	89	<nav class="site-*" id="toc-side">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	89	<aside id="side-menu">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	65	<nav id="site-prev-next">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	34	<header class="card-*">	URL 1, URL 2, URL 3, URL 4, URL 5
warning	1	<main class="focused" id="page-content">	/
No rows found, please edit your search term.

Missing html lang attribute

No problems found.

Security

Header	OK	Notice	Warning	Critical	Recommendation
Content-Security-Policy	0	0	0	121	Content-Security-Policy header is not set. It restricts resources the page can load and prevents XSS attacks.
Feature-Policy	0	0	121	0	Feature-Policy header is not set. It allows enabling/disabling browser APIs and features for security. Not important if Permissions-Policy is set.
Permissions-Policy	0	0	121	0	Permissions-Policy header is not set. It allows enabling/disabling browser APIs and features for security.
X-XSS-Protection	0	121	0	0	X-XSS-Protection header is set but deprecated. Consider removing it and using Content-Security-Policy instead.
Strict-Transport-Security	121	0	0	0
X-Frame-Options	121	0	0	0
X-Content-Type-Options	121	0	0	0
Referrer-Policy	121	0	0	0
Server	121	0	0	0	Server header is not set or empty. This is recommended.

Security headers

Severity	Occurs	Detail	Affected URLs (max 5)
critical	121	Content-Security-Policy header is not set. It restricts resources the page can load and prevents XSS attacks.	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	Permissions-Policy header is not set. It allows enabling/disabling browser APIs and features for security.	URL 1, URL 2, URL 3, URL 4, URL 5
warning	121	Feature-Policy header is not set. It allows enabling/disabling browser APIs and features for security. Not important if Permissions-Policy is set.	URL 1, URL 2, URL 3, URL 4, URL 5
notice	121	X-XSS-Protection header is set but deprecated. Consider removing it and using Content-Security-Policy instead.	URL 1, URL 2, URL 3, URL 4, URL 5
notice	121	Server header is not set or empty. This is recommended.	URL 1, URL 2, URL 3, URL 4, URL 5

TOP non-unique titles

Count 🔽	Title
2	Fetch data from the internet

TOP non-unique descriptions

Count 🔽	Description
6	Learn about the major features in Dart

SEO metadata

Found 121 row(s).

URL 🔼	Indexing	Title	H1	Description
/	Allowed	Dart programming language	Missing H1	Dart is an approachable, portable, and productive language for high-quality apps on any platform.
/brand	Allowed	Dart brand guidelines	Dart brand guidelines	The guidelines governing the usage of the Dart trademarks and assets.
/changelog	Allowed	Dart changelog	Dart changelog	A complete changelog for Dart.
/community	Allowed	Community and support	Community and support	Communities, mailing lists, and bug databases for the Dart project.
/docs	Allowed	Dart documentation	Dart documentation	Learn to use the Dart language and libraries.
/effective-dart	Allowed	Effective Dart	Effective Dart	Best practices for building consistent, maintainable, and efficient Dart libraries.
/effective-dart/design	Allowed	Effective Dart: Design	Effective Dart: Design	Design consistent, usable libraries.
/effective-dart/documentation	Allowed	Effective Dart: Documentation	Effective Dart: Documentation	Clear, helpful comments and documentation.
/effective-dart/style	Allowed	Effective Dart: Style	Effective Dart: Style	Formatting and naming rules for consistent, readable code.
/effective-dart/usage	Allowed	Effective Dart: Usage	Effective Dart: Usage	Guidelines for using language features to write maintainable code.
/get-dart	Allowed	Get the Dart SDK	Get the Dart SDK	Get the libraries and command-line tools that you need to develop Dart web, command-line, and server apps.
/get-dart/archive	Allowed	Dart SDK archive	Dart SDK archive	Download specific stable, beta, dev, and main channel versions of the Dart SDK and the Dart API documentation.
/interop	DENY (meta)	Native interop with Dart	Native interop with Dart	Learn to interact with native code and other programming languages from Dart.
/interop/c-interop	Allowed	C interop using dart:ffi	C interop using dart:ffi	To use C code in your Dart program, use the dart:ffi library.
/interop/java-interop	Allowed	Java interop using package:jnigen	Java interop using package:jnigen	To use Java in your Dart program, use package:jnigen.
/interop/js-interop	Allowed	JavaScript interoperability	JavaScript interoperability	Integrate JavaScript code into your Dart web app.
/interop/js-interop/js-types	Allowed	JS types	JS types	Usage information about the core types in JS interop.
/interop/js-interop/mock	Allowed	How to mock JavaScript interop objects	How to mock JavaScript interop objects	Learn how to mock JS interop objects in Dart for testing.
/interop/js-interop/package-web	Allowed	Migrate to package:web	Migrate to package:web	How to migrate web interop code from dart:html to package:web.
/interop/js-interop/past-js-interop	Allowed	Past JS interop	Past JS interop	Archive of Dart's previous JS interop support.
/interop/js-interop/start	Allowed	Getting started with JavaScript interop	Getting started with JavaScript interop	A basic example of using browser APIs and a bundled JS library.
/interop/js-interop/tutorials	Allowed	JS interop tutorials	JS interop tutorials	Tutorials for common JavaScript interop use cases in Dart.
/interop/js-interop/usage	Allowed	JS interop usage	JS interop usage	How to declare and use JS interop members.
/interop/objective-c-interop	Allowed	Objective-C and Swift interop using package:ffigen	Objective-C and Swift interop using package:ffigen	To use Objective-C and Swift code in your Dart program, use package:ffigen.
/language	Allowed	Introduction to Dart	Introduction to Dart	A brief introduction to Dart programs and important concepts.
/language/async	Allowed	Asynchronous programming	Asynchronous programming	Information on writing asynchronous code in Dart.
/language/branches	Allowed	Branches	Branches	Learn how to use branches to control the flow of your Dart code.
/language/built-in-types	Allowed	Built-in types	Built-in types	Information on the types Dart supports.
/language/callable-objects	Allowed	Callable objects	Callable objects	Learn how to create and use callable objects in Dart.
/language/class-modifiers	Allowed	Class modifiers	Class modifiers	Modifier keywords for class declarations to control external library access.
/language/class-modifiers-for-apis	Allowed	Class modifiers for API maintainers	Class modifiers for API maintainers	How to use the class modifiers added in Dart 3.0 to make your package's API more robust and maintainable.
/language/classes	Allowed	Classes	Classes	Summary of classes, class instances, and their members.
/language/collections	Allowed	Collections	Collections	Summary of the different types of collections in Dart.
/language/comments	Allowed	Comments	Comments	The different comment types in Dart.
/language/concurrency	Allowed	Concurrency in Dart	Concurrency in Dart	Use isolates to enable parallel code execution on multiple processor cores.
/language/constructors	Allowed	Constructors	Constructors	Everything about using constructors in Dart.
/language/dot-shorthands	Allowed	Dot shorthands	Dot shorthands	Learn about the dot shorthand syntax in Dart.
/language/enums	Allowed	Enumerated types	Enumerated types	Learn about the enum type in Dart.
/language/error-handling	Allowed	Error handling	Error handling	Learn about handling errors and exceptions in Dart.
/language/extend	Allowed	Extend a class	Extend a class	Learn how to create subclasses from a superclass.
/language/extension-methods	Allowed	Extension methods	Extension methods	Learn how to add to existing APIs.
/language/extension-types	Allowed	Extension types	Extension types	Learn how to write a static-only interface for an existing type.
/language/functions	Allowed	Functions	Functions	Everything about functions in Dart.
/language/generics	Allowed	Generics	Generics	Learn about generic types in Dart.
/language/isolates	Allowed	Isolates	Isolates	Information on writing isolates in Dart.
/language/keywords	Allowed	Keywords	Keywords	Keywords in Dart.
/language/libraries	Allowed	Libraries & imports	Libraries & imports	Guidance on importing and implementing libraries.
/language/loops	Allowed	Loops	Loops	Learn how to use loops to control the flow of your Dart code.
/language/metadata	Allowed	Metadata	Metadata	Metadata and annotations in Dart.
/language/methods	Allowed	Methods	Methods	Learn about methods in Dart.
/language/mixins	Allowed	Mixins	Mixins	Learn how to add to features to a class in Dart.
/language/modifier-reference	Allowed	Class modifiers reference	Class modifiers reference	The allowed and disallowed combinations of class modifiers.
/language/operators	Allowed	Operators	Operators	Learn about the operators Dart supports.
/language/pattern-types	Allowed	Pattern types	Pattern types	Pattern type reference in Dart.
/language/patterns	Allowed	Patterns	Patterns	Summary of patterns in Dart.
/language/records	Allowed	Records	Records	Summary of the record data structure in Dart.
/language/type-system	Allowed	The Dart type system	The Dart type system	Why and how to write sound Dart code.
/language/typedefs	Allowed	Typedefs	Typedefs	Learn about type aliases in Dart.
/language/variables	Allowed	Variables	Variables	Learn about variables in Dart.
/language/versioning	Allowed	Language versioning	Language versioning	Learn how language versioning in Dart enables evolution of the language and how to configure the language versions of your project and its libraries.
/learn	Allowed	Learn Dart	Learn Dart	Find everything you need to start learning the Dart programming language.
/learn/tutorial	Allowed	Dart tutorial	Dart tutorial	Begin your Dart learning journey by building an interactive CLI app.
/learn/tutorial/advanced-oop	Allowed	Extend your app with enums and extensions	Extend your app with enums and extensions	Enhance your Dart skills by exploring advanced features like enhanced enums and extensions. Improve your application's output formatting and color, making it more user-friendly.
/learn/tutorial/async	Allowed	Write asynchronous code	Write asynchronous code	Learn about asynchronous programming in Dart and how to make HTTP requests.
/learn/tutorial/cli-polish	Allowed	Polish your CLI app	Polish your CLI app	Improve the HelpCommand to provide more detailed information and add an onOutput argument for flexible output handling.
/learn/tutorial/data-and-json	Allowed	Work with JSON data	Work with JSON data	Learn about JSON deserialization in Dart, including how to use `dart:convert`, `jsonDecode`, and pattern matching to work with JSON data from the Wikipedia API.
/learn/tutorial/error-handling	Allowed	Handle errors gracefully	Handle errors gracefully	Improve app robustness by handling errors. Learn about exceptions, errors, `try/catch`, `throw`, and `rethrow`.
/learn/tutorial/fetch-data	Allowed	Fetch data from the internet	Fetch data from the internet	Refactor your application to use a robust, production-ready API client for the Wikipedia CLI.
/learn/tutorial/first-app	Allowed	Build your first app	Build your first app	Create, run, and make your first change to a Dart command-line program.
/learn/tutorial/interactivity	Allowed	Add interactivity to your app	Add interactivity to your app	Add simple commands to your cli application. Learn the fundamentals of Dart syntax including control flow, collections, variables, functions, and more.
/learn/tutorial/logging	Allowed	Add logging for debugging and monitoring	Add logging for debugging and monitoring	Learn how to add logging to your Dart application to help with debugging and monitoring.
/learn/tutorial/object-oriented	Allowed	Define relationships with classes	Define relationships with classes	Learn about object-oriented programming in Dart, including abstract classes, inheritance, overrides, and enums. Build a framework for well-architected CLI apps.
/learn/tutorial/packages-libs	Allowed	Organize Dart code with packages and libraries	Organize Dart code with packages and libraries	Learn how to organize your Dart code into reusable libraries and packages.
/learn/tutorial/testing	Allowed	Test your app & code	Test your app & code	Learn how to write tests for your Dart code using the `package:test` library.
/libraries	Allowed	Dart's core libraries	Dart's core libraries	Learn about Dart's core libraries and APIs.
/libraries/async/async-await	Allowed	Asynchronous programming: futures, async, await	Asynchronous programming: futures, async, await	Learn about and practice writing asynchronous code in DartPad!
/libraries/async/creating-streams	Allowed	Creating streams in Dart	Creating streams in Dart	A stream is a sequence of results; learn how to create your own.
/libraries/async/futures-error-handling	Allowed	Futures and error handling	Futures and error handling	Everything you wanted to know about handling errors and exceptions when writing asynchronous code. And then some.
/libraries/async/using-streams	Allowed	Asynchronous programming: Streams	Asynchronous programming: Streams	Learn how to consume single-subscriber and broadcast streams.
/libraries/async/zones	Allowed	Zones	Zones	Manage your asynchronous code: handle uncaught errors, override behavior (such as printing and scheduling tasks), and more.
/libraries/collections/iterables	Allowed	Iterable collections	Iterable collections	An interactive guide to using Iterable objects such as lists and sets.
/libraries/core/environment-declarations	Allowed	Configuring apps with compilation environment declarations	Configuring apps with compilation environment declarations	Learn about using compilation environment declarations to customize application behavior.
/libraries/dart-async	Allowed	dart:async	dart:async	Learn about the major features in Dart's dart:async library.
/libraries/dart-convert	Allowed	dart:convert	dart:convert	Learn about the major features in Dart's dart:convert library.
/libraries/dart-core	Allowed	dart:core	dart:core	Learn about the major features in Dart's dart:core library.
/libraries/dart-html	Allowed	dart:html	dart:html	Learn about the major features in Dart's dart:html library.
/libraries/dart-io	Allowed	dart:io	dart:io	Learn about the major features in Dart's dart:io library.
/libraries/dart-math	Allowed	dart:math	dart:math	Learn about the major features in Dart's dart:math library.
/libraries/serialization/json	Allowed	Using JSON	Using JSON	Dart solutions for reading and writing JSON.
/multiplatform-apps	Allowed	Multi-platform apps	Multi-platform apps	Use the Flutter framework to build beautiful native apps for many platforms and operating systems from a single codebase.
/null-safety	Allowed	Sound null safety	Sound null safety	An introduction to null safety in Dart.
/null-safety/understanding-null-safety	Allowed	Understanding null safety	Understanding null safety	A deep dive into Dart language and library changes related to null safety.
/overview	Allowed	Dart overview	Dart overview	A short introduction to Dart.
/resources	Allowed	Resources	Resources	Landing page for Dart language resources.
/resources/books	Allowed	Books about Dart	Books about Dart	Read all about it! Here's a collection of books about Dart.
/resources/breaking-changes	Allowed	Breaking changes and deprecations	Breaking changes and deprecations	A list of breaking changes by release in Dart.
/resources/dart-3-migration	Allowed	Dart 3 migration guide	Dart 3 migration guide	How to migrate existing Dart code to be compatible with Dart 3.
/resources/dart-cheatsheet	Allowed	Dart cheatsheet	Dart cheatsheet	Interactively learn (or relearn) some of Dart's unique features.
/resources/dart-team-packages	Allowed	Dart team packages	Dart team packages	The Dart team publishes packages under the verified publishers: dart.dev, tools.dart.dev, and labs.dart.dev.
/resources/glossary	Allowed	Glossary	Glossary	A glossary reference for terminology used across dart.dev.
/resources/google-apis	Allowed	Using Google APIs	Using Google APIs	Your Dart apps can use Firebase and Google client APIs.
/resources/language/evolution	Allowed	Dart language evolution	Dart language evolution	Notable changes and additions to the Dart programming language.
/resources/language/number-representation	Allowed	Numbers in Dart	Numbers in Dart	Learn how Dart numbers are slightly different on the web, when that might matter, and how you might adjust your code.
/resources/language/spec	Allowed	Dart language specification	Dart language specification	The formal specification for the Dart language.
/resources/useful-packages	Allowed	Commonly used packages	Commonly used packages	Some of the most useful and popular packages, and where you can learn more.
/resources/videos	Allowed	Dart videos	Dart videos	Learn by watching! Here's a collection of videos about Dart.
/resources/whats-new	Allowed	What's new	What's new	A list of what's new on dart.dev and related sites.
/search	Allowed	Search dart.dev	Search dart.dev	Search for documentation on dart.dev.
/search-all	Allowed	Search more sites	Search more sites	Search dart.dev, api.dart.dev, the old www.dartlang.org site, flutter.dev, and more.
/security	Allowed	Security	Security	An overview of the Dart team's philosophy and processes for security.
/server	Allowed	Command-line and server apps	Command-line and server apps	All things relating to command-line and server apps.
/server/fetch-data	Allowed	Fetch data from the internet	Fetch data from the internet	Fetch data over the internet using the http package.
/server/google-cloud	Allowed	Using Google Cloud	Using Google Cloud	Your Dart app can use many Google Cloud services: Firebase, Google Cloud Platform, and more.
/server/libraries	Allowed	Command-line and server libraries and packages	Command-line and server libraries and packages	Libraries and packages that can help you write Dart command-line & server apps.
/terms	Allowed	Terms of use	Terms of use	The terms of use for dart.dev.
/web	Allowed	Web platform	Web platform	Resources for developing Dart web apps.
/web/debugging	Allowed	Debugging Dart web apps	Debugging Dart web apps	Learn how to debug your Dart web app.
/web/deployment	Allowed	Web deployment	Web deployment	Learn how to build your Dart web app for production deployment.
/web/get-started	Allowed	Build a web app with Dart	Build a web app with Dart	Get started writing web apps in Dart.
/web/libraries	Allowed	Web libraries and packages	Web libraries and packages	Libraries and packages that can help you write Dart web apps.
/web/wasm	Allowed	WebAssembly (Wasm) compilation	WebAssembly (Wasm) compilation	Learn how to compile your Dart web app to WebAssembly.
No rows found, please edit your search term.

(+) Show entire table

OpenGraph metadata

Found 121 row(s).

URL 🔼	OG Title	OG Description	OG Image	Twitter Title	Twitter Description
/	Dart programming language	Dart is an approachable, portable, and productive language for high-quality apps on any platform.	/assets/img/logo/dart-logo-for-shares.png	Dart programming language	Dart is an approachable, portable, and productive language for high-quality apps on any platform.
/brand	Dart brand guidelines	The guidelines governing the usage of the Dart trademarks and assets.	/assets/img/logo/dart-logo-for-shares.png	Dart brand guidelines	The guidelines governing the usage of the Dart trademarks and assets.
/changelog	Dart changelog	A complete changelog for Dart.	/assets/img/logo/dart-logo-for-shares.png	Dart changelog	A complete changelog for Dart.
/community	Community and support	Communities, mailing lists, and bug databases for the Dart project.	/assets/img/logo/dart-logo-for-shares.png	Community and support	Communities, mailing lists, and bug databases for the Dart project.
/docs	Dart documentation	Learn to use the Dart language and libraries.	/assets/img/logo/dart-logo-for-shares.png	Dart documentation	Learn to use the Dart language and libraries.
/effective-dart	Effective Dart	Best practices for building consistent, maintainable, and efficient Dart libraries.	/assets/img/logo/dart-logo-for-shares.png	Effective Dart	Best practices for building consistent, maintainable, and efficient Dart libraries.
/effective-dart/design	Effective Dart: Design	Design consistent, usable libraries.	/assets/img/logo/dart-logo-for-shares.png	Effective Dart: Design	Design consistent, usable libraries.
/effective-dart/documentation	Effective Dart: Documentation	Clear, helpful comments and documentation.	/assets/img/logo/dart-logo-for-shares.png	Effective Dart: Documentation	Clear, helpful comments and documentation.
/effective-dart/style	Effective Dart: Style	Formatting and naming rules for consistent, readable code.	/assets/img/logo/dart-logo-for-shares.png	Effective Dart: Style	Formatting and naming rules for consistent, readable code.
/effective-dart/usage	Effective Dart: Usage	Guidelines for using language features to write maintainable code.	/assets/img/logo/dart-logo-for-shares.png	Effective Dart: Usage	Guidelines for using language features to write maintainable code.
/get-dart	Get the Dart SDK	Get the libraries and command-line tools that you need to develop Dart web, command-line, and server apps.	/assets/img/logo/dart-logo-for-shares.png	Get the Dart SDK	Get the libraries and command-line tools that you need to develop Dart web, command-line, and server apps.
/get-dart/archive	Dart SDK archive	Download specific stable, beta, dev, and main channel versions of the Dart SDK and the Dart API documentation.	/assets/img/logo/dart-logo-for-shares.png	Dart SDK archive	Download specific stable, beta, dev, and main channel versions of the Dart SDK and the Dart API documentation.
/interop	Native interop with Dart	Learn to interact with native code and other programming languages from Dart.	/assets/img/logo/dart-logo-for-shares.png	Native interop with Dart	Learn to interact with native code and other programming languages from Dart.
/interop/c-interop	C interop using dart:ffi	To use C code in your Dart program, use the dart:ffi library.	/assets/img/logo/dart-logo-for-shares.png	C interop using dart:ffi	To use C code in your Dart program, use the dart:ffi library.
/interop/java-interop	Java interop using package:jnigen	To use Java in your Dart program, use package:jnigen.	/assets/img/logo/dart-logo-for-shares.png	Java interop using package:jnigen	To use Java in your Dart program, use package:jnigen.
/interop/js-interop	JavaScript interoperability	Integrate JavaScript code into your Dart web app.	/assets/img/logo/dart-logo-for-shares.png	JavaScript interoperability	Integrate JavaScript code into your Dart web app.
/interop/js-interop/js-types	JS types	Usage information about the core types in JS interop.	/assets/img/logo/dart-logo-for-shares.png	JS types	Usage information about the core types in JS interop.
/interop/js-interop/mock	How to mock JavaScript interop objects	Learn how to mock JS interop objects in Dart for testing.	/assets/img/logo/dart-logo-for-shares.png	How to mock JavaScript interop objects	Learn how to mock JS interop objects in Dart for testing.
/interop/js-interop/package-web	Migrate to package:web	How to migrate web interop code from dart:html to package:web.	/assets/img/logo/dart-logo-for-shares.png	Migrate to package:web	How to migrate web interop code from dart:html to package:web.
/interop/js-interop/past-js-interop	Past JS interop	Archive of Dart's previous JS interop support.	/assets/img/logo/dart-logo-for-shares.png	Past JS interop	Archive of Dart's previous JS interop support.
/interop/js-interop/start	Getting started with JavaScript interop	A basic example of using browser APIs and a bundled JS library.	/assets/img/logo/dart-logo-for-shares.png	Getting started with JavaScript interop	A basic example of using browser APIs and a bundled JS library.
/interop/js-interop/tutorials	JS interop tutorials	Tutorials for common JavaScript interop use cases in Dart.	/assets/img/logo/dart-logo-for-shares.png	JS interop tutorials	Tutorials for common JavaScript interop use cases in Dart.
/interop/js-interop/usage	JS interop usage	How to declare and use JS interop members.	/assets/img/logo/dart-logo-for-shares.png	JS interop usage	How to declare and use JS interop members.
/interop/objective-c-interop	Objective-C and Swift interop using package:ffigen	To use Objective-C and Swift code in your Dart program, use package:ffigen.	/assets/img/logo/dart-logo-for-shares.png	Objective-C and Swift interop using package:ffigen	To use Objective-C and Swift code in your Dart program, use package:ffigen.
/language	Introduction to Dart	A brief introduction to Dart programs and important concepts.	/assets/img/logo/dart-logo-for-shares.png	Introduction to Dart	A brief introduction to Dart programs and important concepts.
/language/async	Asynchronous programming	Information on writing asynchronous code in Dart.	/assets/img/logo/dart-logo-for-shares.png	Asynchronous programming	Information on writing asynchronous code in Dart.
/language/branches	Branches	Learn how to use branches to control the flow of your Dart code.	/assets/img/logo/dart-logo-for-shares.png	Branches	Learn how to use branches to control the flow of your Dart code.
/language/built-in-types	Built-in types	Information on the types Dart supports.	/assets/img/logo/dart-logo-for-shares.png	Built-in types	Information on the types Dart supports.
/language/callable-objects	Callable objects	Learn how to create and use callable objects in Dart.	/assets/img/logo/dart-logo-for-shares.png	Callable objects	Learn how to create and use callable objects in Dart.
/language/class-modifiers	Class modifiers	Modifier keywords for class declarations to control external library access.	/assets/img/logo/dart-logo-for-shares.png	Class modifiers	Modifier keywords for class declarations to control external library access.
/language/class-modifiers-for-apis	Class modifiers for API maintainers	How to use the class modifiers added in Dart 3.0 to make your package's API more robust and maintainable.	/assets/img/logo/dart-logo-for-shares.png	Class modifiers for API maintainers	How to use the class modifiers added in Dart 3.0 to make your package's API more robust and maintainable.
/language/classes	Classes	Summary of classes, class instances, and their members.	/assets/img/logo/dart-logo-for-shares.png	Classes	Summary of classes, class instances, and their members.
/language/collections	Collections	Summary of the different types of collections in Dart.	/assets/img/logo/dart-logo-for-shares.png	Collections	Summary of the different types of collections in Dart.
/language/comments	Comments	The different comment types in Dart.	/assets/img/logo/dart-logo-for-shares.png	Comments	The different comment types in Dart.
/language/concurrency	Concurrency in Dart	Use isolates to enable parallel code execution on multiple processor cores.	/assets/img/logo/dart-logo-for-shares.png	Concurrency in Dart	Use isolates to enable parallel code execution on multiple processor cores.
/language/constructors	Constructors	Everything about using constructors in Dart.	/assets/img/logo/dart-logo-for-shares.png	Constructors	Everything about using constructors in Dart.
/language/dot-shorthands	Dot shorthands	Learn about the dot shorthand syntax in Dart.	/assets/img/logo/dart-logo-for-shares.png	Dot shorthands	Learn about the dot shorthand syntax in Dart.
/language/enums	Enumerated types	Learn about the enum type in Dart.	/assets/img/logo/dart-logo-for-shares.png	Enumerated types	Learn about the enum type in Dart.
/language/error-handling	Error handling	Learn about handling errors and exceptions in Dart.	/assets/img/logo/dart-logo-for-shares.png	Error handling	Learn about handling errors and exceptions in Dart.
/language/extend	Extend a class	Learn how to create subclasses from a superclass.	/assets/img/logo/dart-logo-for-shares.png	Extend a class	Learn how to create subclasses from a superclass.
/language/extension-methods	Extension methods	Learn how to add to existing APIs.	/assets/img/logo/dart-logo-for-shares.png	Extension methods	Learn how to add to existing APIs.
/language/extension-types	Extension types	Learn how to write a static-only interface for an existing type.	/assets/img/logo/dart-logo-for-shares.png	Extension types	Learn how to write a static-only interface for an existing type.
/language/functions	Functions	Everything about functions in Dart.	/assets/img/logo/dart-logo-for-shares.png	Functions	Everything about functions in Dart.
/language/generics	Generics	Learn about generic types in Dart.	/assets/img/logo/dart-logo-for-shares.png	Generics	Learn about generic types in Dart.
/language/isolates	Isolates	Information on writing isolates in Dart.	/assets/img/logo/dart-logo-for-shares.png	Isolates	Information on writing isolates in Dart.
/language/keywords	Keywords	Keywords in Dart.	/assets/img/logo/dart-logo-for-shares.png	Keywords	Keywords in Dart.
/language/libraries	Libraries & imports	Guidance on importing and implementing libraries.	/assets/img/logo/dart-logo-for-shares.png	Libraries & imports	Guidance on importing and implementing libraries.
/language/loops	Loops	Learn how to use loops to control the flow of your Dart code.	/assets/img/logo/dart-logo-for-shares.png	Loops	Learn how to use loops to control the flow of your Dart code.
/language/metadata	Metadata	Metadata and annotations in Dart.	/assets/img/logo/dart-logo-for-shares.png	Metadata	Metadata and annotations in Dart.
/language/methods	Methods	Learn about methods in Dart.	/assets/img/logo/dart-logo-for-shares.png	Methods	Learn about methods in Dart.
/language/mixins	Mixins	Learn how to add to features to a class in Dart.	/assets/img/logo/dart-logo-for-shares.png	Mixins	Learn how to add to features to a class in Dart.
/language/modifier-reference	Class modifiers reference	The allowed and disallowed combinations of class modifiers.	/assets/img/logo/dart-logo-for-shares.png	Class modifiers reference	The allowed and disallowed combinations of class modifiers.
/language/operators	Operators	Learn about the operators Dart supports.	/assets/img/logo/dart-logo-for-shares.png	Operators	Learn about the operators Dart supports.
/language/pattern-types	Pattern types	Pattern type reference in Dart.	/assets/img/logo/dart-logo-for-shares.png	Pattern types	Pattern type reference in Dart.
/language/patterns	Patterns	Summary of patterns in Dart.	/assets/img/logo/dart-logo-for-shares.png	Patterns	Summary of patterns in Dart.
/language/records	Records	Summary of the record data structure in Dart.	/assets/img/logo/dart-logo-for-shares.png	Records	Summary of the record data structure in Dart.
/language/type-system	The Dart type system	Why and how to write sound Dart code.	/assets/img/logo/dart-logo-for-shares.png	The Dart type system	Why and how to write sound Dart code.
/language/typedefs	Typedefs	Learn about type aliases in Dart.	/assets/img/logo/dart-logo-for-shares.png	Typedefs	Learn about type aliases in Dart.
/language/variables	Variables	Learn about variables in Dart.	/assets/img/logo/dart-logo-for-shares.png	Variables	Learn about variables in Dart.
/language/versioning	Language versioning	Learn how language versioning in Dart enables evolution of the language and how to configure the language versions of your project and its libraries.	/assets/img/logo/dart-logo-for-shares.png	Language versioning	Learn how language versioning in Dart enables evolution of the language and how to configure the language versions of your project and its libraries.
/learn	Learn Dart	Find everything you need to start learning the Dart programming language.	/assets/img/logo/dart-logo-for-shares.png	Learn Dart	Find everything you need to start learning the Dart programming language.
/learn/tutorial	Dart tutorial	Begin your Dart learning journey by building an interactive CLI app.	/assets/img/logo/dart-logo-for-shares.png	Dart tutorial	Begin your Dart learning journey by building an interactive CLI app.
/learn/tutorial/advanced-oop	Extend your app with enums and extensions	Enhance your Dart skills by exploring advanced features like enhanced enums and extensions. Improve your application's output formatting and color, making it more user-friendly.	/assets/img/logo/dart-logo-for-shares.png	Extend your app with enums and extensions	Enhance your Dart skills by exploring advanced features like enhanced enums and extensions. Improve your application's output formatting and color, making it more user-friendly.
/learn/tutorial/async	Write asynchronous code	Learn about asynchronous programming in Dart and how to make HTTP requests.	/assets/img/logo/dart-logo-for-shares.png	Write asynchronous code	Learn about asynchronous programming in Dart and how to make HTTP requests.
/learn/tutorial/cli-polish	Polish your CLI app	Improve the HelpCommand to provide more detailed information and add an onOutput argument for flexible output handling.	/assets/img/logo/dart-logo-for-shares.png	Polish your CLI app	Improve the HelpCommand to provide more detailed information and add an onOutput argument for flexible output handling.
/learn/tutorial/data-and-json	Work with JSON data	Learn about JSON deserialization in Dart, including how to use `dart:convert`, `jsonDecode`, and pattern matching to work with JSON data from the Wikipedia API.	/assets/img/logo/dart-logo-for-shares.png	Work with JSON data	Learn about JSON deserialization in Dart, including how to use `dart:convert`, `jsonDecode`, and pattern matching to work with JSON data from the Wikipedia API.
/learn/tutorial/error-handling	Handle errors gracefully	Improve app robustness by handling errors. Learn about exceptions, errors, `try/catch`, `throw`, and `rethrow`.	/assets/img/logo/dart-logo-for-shares.png	Handle errors gracefully	Improve app robustness by handling errors. Learn about exceptions, errors, `try/catch`, `throw`, and `rethrow`.
/learn/tutorial/fetch-data	Fetch data from the internet	Refactor your application to use a robust, production-ready API client for the Wikipedia CLI.	/assets/img/logo/dart-logo-for-shares.png	Fetch data from the internet	Refactor your application to use a robust, production-ready API client for the Wikipedia CLI.
/learn/tutorial/first-app	Build your first app	Create, run, and make your first change to a Dart command-line program.	/assets/img/logo/dart-logo-for-shares.png	Build your first app	Create, run, and make your first change to a Dart command-line program.
/learn/tutorial/interactivity	Add interactivity to your app	Add simple commands to your cli application. Learn the fundamentals of Dart syntax including control flow, collections, variables, functions, and more.	/assets/img/logo/dart-logo-for-shares.png	Add interactivity to your app	Add simple commands to your cli application. Learn the fundamentals of Dart syntax including control flow, collections, variables, functions, and more.
/learn/tutorial/logging	Add logging for debugging and monitoring	Learn how to add logging to your Dart application to help with debugging and monitoring.	/assets/img/logo/dart-logo-for-shares.png	Add logging for debugging and monitoring	Learn how to add logging to your Dart application to help with debugging and monitoring.
/learn/tutorial/object-oriented	Define relationships with classes	Learn about object-oriented programming in Dart, including abstract classes, inheritance, overrides, and enums. Build a framework for well-architected CLI apps.	/assets/img/logo/dart-logo-for-shares.png	Define relationships with classes	Learn about object-oriented programming in Dart, including abstract classes, inheritance, overrides, and enums. Build a framework for well-architected CLI apps.
/learn/tutorial/packages-libs	Organize Dart code with packages and libraries	Learn how to organize your Dart code into reusable libraries and packages.	/assets/img/logo/dart-logo-for-shares.png	Organize Dart code with packages and libraries	Learn how to organize your Dart code into reusable libraries and packages.
/learn/tutorial/testing	Test your app & code	Learn how to write tests for your Dart code using the `package:test` library.	/assets/img/logo/dart-logo-for-shares.png	Test your app & code	Learn how to write tests for your Dart code using the `package:test` library.
/libraries	Dart's core libraries	Learn about Dart's core libraries and APIs.	/assets/img/logo/dart-logo-for-shares.png	Dart's core libraries	Learn about Dart's core libraries and APIs.
/libraries/async/async-await	Asynchronous programming: futures, async, await	Learn about and practice writing asynchronous code in DartPad!	/assets/img/logo/dart-logo-for-shares.png	Asynchronous programming: futures, async, await	Learn about and practice writing asynchronous code in DartPad!
/libraries/async/creating-streams	Creating streams in Dart	A stream is a sequence of results; learn how to create your own.	/assets/img/logo/dart-logo-for-shares.png	Creating streams in Dart	A stream is a sequence of results; learn how to create your own.
/libraries/async/futures-error-handling	Futures and error handling	Everything you wanted to know about handling errors and exceptions when writing asynchronous code. And then some.	/assets/img/logo/dart-logo-for-shares.png	Futures and error handling	Everything you wanted to know about handling errors and exceptions when writing asynchronous code. And then some.
/libraries/async/using-streams	Asynchronous programming: Streams	Learn how to consume single-subscriber and broadcast streams.	/assets/img/logo/dart-logo-for-shares.png	Asynchronous programming: Streams	Learn how to consume single-subscriber and broadcast streams.
/libraries/async/zones	Zones	Manage your asynchronous code: handle uncaught errors, override behavior (such as printing and scheduling tasks), and more.	/assets/img/logo/dart-logo-for-shares.png	Zones	Manage your asynchronous code: handle uncaught errors, override behavior (such as printing and scheduling tasks), and more.
/libraries/collections/iterables	Iterable collections	An interactive guide to using Iterable objects such as lists and sets.	/assets/img/logo/dart-logo-for-shares.png	Iterable collections	An interactive guide to using Iterable objects such as lists and sets.
/libraries/core/environment-declarations	Configuring apps with compilation environment declarations	Learn about using compilation environment declarations to customize application behavior.	/assets/img/logo/dart-logo-for-shares.png	Configuring apps with compilation environment declarations	Learn about using compilation environment declarations to customize application behavior.
/libraries/dart-async	dart:async	Learn about the major features in Dart's dart:async library.	/assets/img/logo/dart-logo-for-shares.png	dart:async	Learn about the major features in Dart's dart:async library.
/libraries/dart-convert	dart:convert	Learn about the major features in Dart's dart:convert library.	/assets/img/logo/dart-logo-for-shares.png	dart:convert	Learn about the major features in Dart's dart:convert library.
/libraries/dart-core	dart:core	Learn about the major features in Dart's dart:core library.	/assets/img/logo/dart-logo-for-shares.png	dart:core	Learn about the major features in Dart's dart:core library.
/libraries/dart-html	dart:html	Learn about the major features in Dart's dart:html library.	/assets/img/logo/dart-logo-for-shares.png	dart:html	Learn about the major features in Dart's dart:html library.
/libraries/dart-io	dart:io	Learn about the major features in Dart's dart:io library.	/assets/img/logo/dart-logo-for-shares.png	dart:io	Learn about the major features in Dart's dart:io library.
/libraries/dart-math	dart:math	Learn about the major features in Dart's dart:math library.	/assets/img/logo/dart-logo-for-shares.png	dart:math	Learn about the major features in Dart's dart:math library.
/libraries/serialization/json	Using JSON	Dart solutions for reading and writing JSON.	/assets/img/logo/dart-logo-for-shares.png	Using JSON	Dart solutions for reading and writing JSON.
/multiplatform-apps	Multi-platform apps	Use the Flutter framework to build beautiful native apps for many platforms and operating systems from a single codebase.	/assets/img/logo/dart-logo-for-shares.png	Multi-platform apps	Use the Flutter framework to build beautiful native apps for many platforms and operating systems from a single codebase.
/null-safety	Sound null safety	An introduction to null safety in Dart.	/assets/img/logo/dart-logo-for-shares.png	Sound null safety	An introduction to null safety in Dart.
/null-safety/understanding-null-safety	Understanding null safety	A deep dive into Dart language and library changes related to null safety.	/assets/img/logo/dart-logo-for-shares.png	Understanding null safety	A deep dive into Dart language and library changes related to null safety.
/overview	Dart overview	A short introduction to Dart.	/assets/img/logo/dart-logo-for-shares.png	Dart overview	A short introduction to Dart.
/resources	Resources	Landing page for Dart language resources.	/assets/img/logo/dart-logo-for-shares.png	Resources	Landing page for Dart language resources.
/resources/books	Books about Dart	Read all about it! Here's a collection of books about Dart.	/assets/img/logo/dart-logo-for-shares.png	Books about Dart	Read all about it! Here's a collection of books about Dart.
/resources/breaking-changes	Breaking changes and deprecations	A list of breaking changes by release in Dart.	/assets/img/logo/dart-logo-for-shares.png	Breaking changes and deprecations	A list of breaking changes by release in Dart.
/resources/dart-3-migration	Dart 3 migration guide	How to migrate existing Dart code to be compatible with Dart 3.	/assets/img/logo/dart-logo-for-shares.png	Dart 3 migration guide	How to migrate existing Dart code to be compatible with Dart 3.
/resources/dart-cheatsheet	Dart cheatsheet	Interactively learn (or relearn) some of Dart's unique features.	/assets/img/logo/dart-logo-for-shares.png	Dart cheatsheet	Interactively learn (or relearn) some of Dart's unique features.
/resources/dart-team-packages	Dart team packages	The Dart team publishes packages under the verified publishers: dart.dev, tools.dart.dev, and labs.dart.dev.	/assets/img/logo/dart-logo-for-shares.png	Dart team packages	The Dart team publishes packages under the verified publishers: dart.dev, tools.dart.dev, and labs.dart.dev.
/resources/glossary	Glossary	A glossary reference for terminology used across dart.dev.	/assets/img/logo/dart-logo-for-shares.png	Glossary	A glossary reference for terminology used across dart.dev.
/resources/google-apis	Using Google APIs	Your Dart apps can use Firebase and Google client APIs.	/assets/img/logo/dart-logo-for-shares.png	Using Google APIs	Your Dart apps can use Firebase and Google client APIs.
/resources/language/evolution	Dart language evolution	Notable changes and additions to the Dart programming language.	/assets/img/logo/dart-logo-for-shares.png	Dart language evolution	Notable changes and additions to the Dart programming language.
/resources/language/number-representation	Numbers in Dart	Learn how Dart numbers are slightly different on the web, when that might matter, and how you might adjust your code.	/assets/img/logo/dart-logo-for-shares.png	Numbers in Dart	Learn how Dart numbers are slightly different on the web, when that might matter, and how you might adjust your code.
/resources/language/spec	Dart language specification	The formal specification for the Dart language.	/assets/img/logo/dart-logo-for-shares.png	Dart language specification	The formal specification for the Dart language.
/resources/useful-packages	Commonly used packages	Some of the most useful and popular packages, and where you can learn more.	/assets/img/logo/dart-logo-for-shares.png	Commonly used packages	Some of the most useful and popular packages, and where you can learn more.
/resources/videos	Dart videos	Learn by watching! Here's a collection of videos about Dart.	/assets/img/logo/dart-logo-for-shares.png	Dart videos	Learn by watching! Here's a collection of videos about Dart.
/resources/whats-new	What's new	A list of what's new on dart.dev and related sites.	/assets/img/logo/dart-logo-for-shares.png	What's new	A list of what's new on dart.dev and related sites.
/search	Search dart.dev	Search for documentation on dart.dev.	/assets/img/logo/dart-logo-for-shares.png	Search dart.dev	Search for documentation on dart.dev.
/search-all	Search more sites	Search dart.dev, api.dart.dev, the old www.dartlang.org site, flutter.dev, and more.	/assets/img/logo/dart-logo-for-shares.png	Search more sites	Search dart.dev, api.dart.dev, the old www.dartlang.org site, flutter.dev, and more.
/security	Security	An overview of the Dart team's philosophy and processes for security.	/assets/img/logo/dart-logo-for-shares.png	Security	An overview of the Dart team's philosophy and processes for security.
/server	Command-line and server apps	All things relating to command-line and server apps.	/assets/img/logo/dart-logo-for-shares.png	Command-line and server apps	All things relating to command-line and server apps.
/server/fetch-data	Fetch data from the internet	Fetch data over the internet using the http package.	/assets/img/logo/dart-logo-for-shares.png	Fetch data from the internet	Fetch data over the internet using the http package.
/server/google-cloud	Using Google Cloud	Your Dart app can use many Google Cloud services: Firebase, Google Cloud Platform, and more.	/assets/img/logo/dart-logo-for-shares.png	Using Google Cloud	Your Dart app can use many Google Cloud services: Firebase, Google Cloud Platform, and more.
/server/libraries	Command-line and server libraries and packages	Libraries and packages that can help you write Dart command-line & server apps.	/assets/img/logo/dart-logo-for-shares.png	Command-line and server libraries and packages	Libraries and packages that can help you write Dart command-line & server apps.
/terms	Terms of use	The terms of use for dart.dev.	/assets/img/logo/dart-logo-for-shares.png	Terms of use	The terms of use for dart.dev.
/web	Web platform	Resources for developing Dart web apps.	/assets/img/logo/dart-logo-for-shares.png	Web platform	Resources for developing Dart web apps.
/web/debugging	Debugging Dart web apps	Learn how to debug your Dart web app.	/assets/img/logo/dart-logo-for-shares.png	Debugging Dart web apps	Learn how to debug your Dart web app.
/web/deployment	Web deployment	Learn how to build your Dart web app for production deployment.	/assets/img/logo/dart-logo-for-shares.png	Web deployment	Learn how to build your Dart web app for production deployment.
/web/get-started	Build a web app with Dart	Get started writing web apps in Dart.	/assets/img/logo/dart-logo-for-shares.png	Build a web app with Dart	Get started writing web apps in Dart.
/web/libraries	Web libraries and packages	Libraries and packages that can help you write Dart web apps.	/assets/img/logo/dart-logo-for-shares.png	Web libraries and packages	Libraries and packages that can help you write Dart web apps.
/web/wasm	WebAssembly (Wasm) compilation	Learn how to compile your Dart web app to WebAssembly.	/assets/img/logo/dart-logo-for-shares.png	WebAssembly (Wasm) compilation	Learn how to compile your Dart web app to WebAssembly.
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Heading structure	Count	Errors 🔽	URL
<h1> Books about Dart [#document-title] <h3> Dart Apprentice: Fundamentals [#dart-apprentice-fundamentals] <h3> Dart Apprentice: Beyond the Basics [#dart-apprentice-beyond-the-basics] <h3> Data Structures & Algorithms in Dart [#data-structures-algorithms-in-dart] <h3> The Art of Dart: Master the Dart Programming Language [#the-art-of-dart-master-the-dart-programming-language] <h3> O guia de Dart [#o-guia-de-dart] <h3> Основы Dart [#основы-dart]	7	6	/resources/books
<h2> Try Dart in your browser <h3> Want more practice? Learn the language, explore the core libraries, or build a command-line app.	2	2	/
<h1> Dart tutorial [#document-title] <h3> Before you begin [#before-you-begin] <h2> Lessons [#lessons]	3	1	/learn/tutorial
<h1> Extend your app with enums and extensions [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Enhance the console color enum [#task-1-enhance-the-console-color-enum] <h3> Task 2: Create a String extension [#task-2-create-a-string-extension] <h3> Task 3: Update command_runner package [#task-3-update-command_runner-package] <h3> Task 4: Implement colorful echo command [#task-4-implement-colorful-echo-command] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	13	1	/learn/tutorial/advanced-oop
<h1> Work with JSON data [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Create the Wikipedia package [#task-1-create-the-wikipedia-package] <h3> Task 2: Configure a Dart workspace [#task-2-configure-a-dart-workspace] <h3> Task 3: Create the Summary class [#task-3-create-the-summary-class] <h3> Task 4: Create the TitleSet class [#task-4-create-the-titleset-class] <h3> Task 5: Create the Article class [#task-5-create-the-article-class] <h3> Task 6: Create the SearchResults class [#task-6-create-the-searchresults-class] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	15	1	/learn/tutorial/data-and-json
<h1> Build your first app [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Confirm your Dart setup [#task-1-confirm-your-dart-setup] <h3> Task 2: Create a new Dart project [#task-2-create-a-new-dart-project] <h3> Task 3: Run your first Dart program [#task-3-run-your-first-dart-program] <h3> Task 4: Make your first code change [#task-4-make-your-first-code-change] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	13	1	/learn/tutorial/first-app
<h1> Add logging for debugging and monitoring [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Add the logging package [#task-1-add-the-logging-package] <h3> Task 2: Create a logger [#task-2-create-a-logger] <h3> Task 3: Use the logger in cli.dart [#task-3-use-the-logger-in-cli-dart] <h3> Task 4: Create the SearchCommand command [#task-4-create-the-searchcommand-command] <h3> Task 5: Create the GetArticleCommand command [#task-5-create-the-getarticlecommand-command] <h3> Task 6: Run the application and check the logs [#task-6-run-the-application-and-check-the-logs] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	15	1	/learn/tutorial/logging
<h1> Fetch data from the internet [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Add the http dependency to the wikipedia package [#task-1-add-the-http-dependency-to-the-wikipedia-package] <h3> Task 2: Implement Wikipedia API calls [#task-2-implement-wikipedia-api-calls] <h3> Task 3: Export the API functions [#task-3-export-the-api-functions] <h2> Task 4: Verify with tests [#task-4-verify-with-tests] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	13	1	/learn/tutorial/fetch-data
<h1> Define relationships with classes [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Define the argument hierarchy [#task-1-define-the-argument-hierarchy] <h3> Task 2: Update the CommandRunner class [#task-2-update-the-commandrunner-class] <h3> Task 3: Create a HelpCommand [#task-3-create-a-helpcommand] <h3> Task 4: Update cli.dart to use the new CommandRunner [#task-4-update-cli-dart-to-use-the-new-commandrunner] <h3> Task 5: Run the application [#task-5-run-the-application] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	14	1	/learn/tutorial/object-oriented
<h1> Polish your CLI app [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1 Improve the HelpCommand output [#task-1-improve-the-helpcommand-output] <h3> Task 2 Add an onOutput callback [#task-2-add-an-onoutput-callback] <h3> Task 3 Use the onOutput callback [#task-3-use-the-onoutput-callback] <h3> Task 4 Test the changes [#task-4-test-the-changes] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	13	1	/learn/tutorial/cli-polish
<h1> Test your app & code [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Add the test dependency [#task-1-add-the-test-dependency] <h3> Task 2: Create a test file and add imports [#task-2-create-a-test-file-and-add-imports] <h3> Task 3: Create the test data files [#task-3-create-the-test-data-files] <h3> Task 4: Write tests for JSON deserialization [#task-4-write-tests-for-json-deserialization] <h3> Task 5: Run the tests [#task-5-run-the-tests] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	14	1	/learn/tutorial/testing
<h1> Add interactivity to your app [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Implement version and help commands [#task-1-implement-version-and-help-commands] <h3> Task 2: Implement the search command [#task-2-implement-the-search-command] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	11	1	/learn/tutorial/interactivity
<h1> Handle errors gracefully [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Create a custom ArgumentException [#task-1-create-a-custom-argumentexception] <h2> Task 2: Implement error handling in CommandRunner [#task-2-implement-error-handling-in-commandrunner] <h3> Task 3: Update cli.dart to use the new error handling [#task-3-update-cli-dart-to-use-the-new-error-handling] <h3> Task 4: Update command_runner library exports [#task-4-update-command_runner-library-exports] <h3> Task 5: Test the new error handling [#task-5-test-the-new-error-handling] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	14	1	/learn/tutorial/error-handling
<h1> Write asynchronous code [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Add the http dependency [#task-1-add-the-http-dependency] <h3> Task 2: Import the http package [#task-2-import-the-http-package] <h3> Task 3: Implement the getWikipediaArticle function [#task-3-implement-the-getwikipediaarticle-function] <h3> Task 4: Integrate the API call into searchWikipedia [#task-4-integrate-the-api-call-into-searchwikipedia] <h3> Task 5: Update main to call searchWikipedia [#task-5-update-main-to-call-searchwikipedia] <h3> Task 6: Run the application [#task-6-run-the-application] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	15	1	/learn/tutorial/async
<h1> Organize Dart code with packages and libraries [#document-title] <h3> What you'll accomplish <h2> Prerequisites [#prerequisites] <h2> Tasks [#tasks] <h3> Task 1: Create the command_runner package [#task-1-create-the-command_runner-package] <h3> Task 2: Implement the CommandRunner class [#task-2-implement-the-commandrunner-class] <h3> Task 3: Add command_runner as a dependency [#task-3-add-command_runner-as-a-dependency] <h3> Task 4: Import and use the command_runner package [#task-4-import-and-use-the-command_runner-package] <h3> Task 5: Run the application [#task-5-run-the-application] <h2> Review [#review] <h3> What you accomplished <h2> Quiz [#quiz] <h3> Check your understanding <h2> Next lesson [#next-lesson]	14	1	/learn/tutorial/packages-libs
<h1> Dart documentation [#document-title]	1	0	/docs
<h1> dart:convert [#document-title] <h2> Decoding and encoding JSON [#decoding-and-encoding-json] <h2> Decoding and encoding UTF-8 characters [#decoding-and-encoding-utf-8-characters] <h2> Other functionality [#other-functionality]	4	0	/libraries/dart-convert
<h1> Community and support [#document-title] <h2> Stay informed [#stay-informed] <h2> Contribute [#contribute] <h2> Join the conversation [#join-the-conversation] <h3> Communities [#communities] <h3> Google Groups [#google-groups]	6	0	/community
<h1> Dot shorthands [#document-title] <h2> Overview [#overview] <h2> The role of context type [#the-role-of-context-type] <h2> Lexical structure and syntax [#lexical-structure-and-syntax] <h3> Enums [#enums] <h3> Named constructors [#named-constructors] <h3> Unnamed constructors [#unnamed-constructors] <h3> Static members [#static-members] <h3> Constant expressions [#constant-expressions] <h2> Rules and limitations [#rules-and-limitations] <h3> Clear context type required in chains [#clear-context-type-required-in-chains] <h3> Asymmetric equality checks [#asymmetric-equality-checks] <h3> Expression statements can't start with . [#expression-statements-cant-start-with] <h3> Limited handling of union types [#limited-handling-of-union-types]	14	0	/language/dot-shorthands
<h1> Dart 3 migration guide [#document-title] <h2> Introduction [#introduction] <h3> Unversioned vs versioned changes [#unversioned-vs-versioned-changes] <h3> Dart 3 backwards compatibility [#dart-3-backwards-compatibility] <h3> Testing for impact [#testing-for-impact] <h2> Dart 3 language changes [#dart-3-language-changes] <h3> 100% sound null safety [#100-sound-null-safety] <h3> Colon-syntax for default values [#colon-syntax-for-default-values] <h3> mixin [#mixin] <h3> switch [#switch] <h3> continue [#continue] <h2> Dart 3 core library changes [#dart-3-core-library-changes] <h3> APIs removed [#apis-removed] <h3> Extends & implements [#extends-implements] <h2> Dart 3 tools changes [#dart-3-tools-changes] <h3> Removed tools [#removed-tools] <h3> Null safety migration tools [#null-safety-migration-tools] <h3> Analyzer config [#analyzer-config] <h3> Other tools changes [#other-tools-changes]	19	0	/resources/dart-3-migration
<h1> Sound null safety [#document-title] <h2> Examples [#examples] <h2> Null safety principles [#null-safety-principles] <h2> Historical migration resources [#migrate]	4	0	/null-safety
<h1> Security [#document-title] <h2> Security philosophy [#security-philosophy] <h2> Reporting vulnerabilities [#reporting-vulnerabilities] <h2> Flagging existing issues as security-related [#flagging-existing-issues-as-security-related] <h2> Supported versions [#supported-versions] <h2> Expectations [#expectations] <h2> Receiving security updates [#receiving-security-updates] <h2> Best practices [#best-practices]	8	0	/security
<h1> Asynchronous programming [#document-title] <h2> Handling Futures [#handling-futures] <h2> Declaring async functions [#declaring-async-functions] <h2> Handling Streams [#handling-streams]	4	0	/language/async
<h1> JavaScript interoperability [#document-title] <h2> Overview [#overview] <h2> Additional resources [#additional-resources]	3	0	/interop/js-interop
<h1> Dart overview [#document-title] <h2> Dart: The language [#language] <h2> Dart: The libraries [#libraries] <h2> Dart: The platforms [#platform] <h2> Learning Dart [#learning-dart]	5	0	/overview
<h1> Classes [#document-title] <h2> Using class members [#using-class-members] <h2> Using constructors [#using-constructors] <h2> Getting an object's type [#getting-an-objects-type] <h2> Instance variables [#instance-variables] <h2> Implicit interfaces [#implicit-interfaces] <h2> Class variables and methods [#class-variables-and-methods] <h3> Static variables [#static-variables] <h3> Static methods [#static-methods]	9	0	/language/classes
<h1> dart:core [#document-title] <h2> Printing to the console [#printing-to-the-console] <h2> Numbers [#numbers] <h2> Strings and regular expressions [#strings-and-regular-expressions] <h3> Searching inside a string [#searching-inside-a-string] <h3> Extracting data from a string [#extracting-data-from-a-string] <h3> Converting to uppercase or lowercase [#converting-to-uppercase-or-lowercase] <h3> Trimming and empty strings [#trimming-and-empty-strings] <h3> Replacing part of a string [#replacing-part-of-a-string] <h3> Building a string [#building-a-string] <h3> Regular expressions [#regular-expressions] <h3> More information [#more-information] <h2> Collections [#collections] <h3> Lists [#lists] <h3> Sets [#sets] <h3> Maps [#maps] <h3> Common collection methods [#common-collection-methods] <h2> URIs [#uris] <h3> Encoding and decoding fully qualified URIs [#encoding-and-decoding-fully-qualified-uris] <h3> Encoding and decoding URI components [#encoding-and-decoding-uri-components] <h3> Parsing URIs [#parsing-uris] <h3> Building URIs [#building-uris] <h2> Dates and times [#dates-and-times] <h2> Utility classes [#utility-classes] <h3> Comparing objects [#comparing-objects] <h3> Implementing map keys [#implementing-map-keys] <h3> Iteration [#iteration] <h2> Exceptions [#exceptions] <h2> Weak references and finalizers [#weak-references-and-finalizers]	29	0	/libraries/dart-core
<h1> Terms of use [#document-title]	1	0	/terms
<h1> Enumerated types [#document-title] <h2> Declaring simple enums [#declaring-simple-enums] <h2> Declaring enhanced enums [#declaring-enhanced-enums] <h2> Using enums [#using-enums]	4	0	/language/enums
<h1> Branches [#document-title] <h2> If [#if] <h3> If-case [#if-case] <h2> Switch statements [#switch-statements] <h3> Switch expressions [#switch-expressions] <h3> Exhaustiveness checking [#exhaustiveness-checking] <h2> Guard clause [#guard-clause]	7	0	/language/branches
<h1> Generics [#document-title] <h2> Why use generics? [#why-use-generics] <h2> Using collection literals [#using-collection-literals] <h2> Using parameterized types with constructors [#using-parameterized-types-with-constructors] <h2> Generic collections and the types they contain [#generic-collections-and-the-types-they-contain] <h2> Restricting the parameterized type [#restricting-the-parameterized-type] <h3> Self-referential type parameter restrictions (F-bounds) [#f-bounds] <h2> Using generic methods [#using-generic-methods]	8	0	/language/generics
<h1> WebAssembly (Wasm) compilation [#document-title] <h2> WebAssembly support [#webassembly-support] <h3> Supported packages [#supported-packages] <h2> Compiling your web app to Wasm [#compiling-to-wasm]	4	0	/web/wasm
<h1> Functions [#document-title] <h2> Parameters [#parameters] <h3> Named parameters [#named-parameters] <h3> Optional positional parameters [#optional-positional-parameters] <h2> The main() function [#main] <h2> Functions as first-class objects [#functions-as-first-class-objects] <h2> Function types [#function-types] <h2> Anonymous functions [#anonymous-functions] <h2> Lexical scope [#lexical-scope] <h2> Lexical closures [#lexical-closures] <h2> Tear-offs [#tear-offs] <h2> Testing functions for equality [#testing-functions-for-equality] <h2> Return values [#return-values] <h2> Getters and setters [#getters-and-setters] <h2> Generators [#generators] <h2> External functions [#external]	16	0	/language/functions
<h1> Web platform [#document-title]	1	0	/web
<h1> Mixins [#document-title] <h2> Specify members a mixin can call on itself [#specify-members-a-mixin-can-call-on-itself] <h3> Define abstract members in the mixin [#define-abstract-members-in-the-mixin] <h3> Implement an interface [#implement-an-interface] <h3> Use the on clause to declare a superclass [#use-the-on-clause-to-declare-a-superclass] <h2> class, mixin, or mixin class? [#class-mixin-or-mixin-class]	6	0	/language/mixins
<h1> Asynchronous programming: futures, async, await [#document-title] <h2> Why asynchronous code matters [#why-asynchronous-code-matters] <h3> Example: Incorrectly using an asynchronous function [#example-incorrectly-using-an-asynchronous-function] <h2> What is a future? [#what-is-a-future] <h3> Uncompleted [#uncompleted] <h3> Completed [#completed] <h3> Example: Introducing futures [#example-introducing-futures] <h3> Example: Completing with an error [#example-completing-with-an-error] <h2> Working with futures: async and await [#working-with-futures-async-and-await] <h3> Execution flow with async and await [#execution-flow-with-async-and-await] <h3> Example: Execution within async functions [#example-execution-within-async-functions] <h3> Exercise: Practice using async and await [#exercise-practice-using-async-and-await] <h2> Handling errors [#handling-errors] <h3> Example: async and await with try-catch [#example-async-and-await-with-try-catch] <h3> Exercise: Practice handling errors [#exercise-practice-handling-errors] <h2> Exercise: Putting it all together [#exercise-putting-it-all-together] <h2> Which lints work for futures? [#which-lints-work-for-futures] <h2> What's next? [#whats-next]	18	0	/libraries/async/async-await
<h1> Pattern types [#document-title] <h2> Logical-or [#logical-or] <h2> Logical-and [#logical-and] <h2> Relational [#relational] <h2> Cast [#cast] <h2> Null-check [#null-check] <h2> Null-assert [#null-assert] <h2> Constant [#constant] <h2> Variable [#variable] <h2> Identifier [#identifier] <h2> Parenthesized [#parenthesized] <h2> List [#list] <h3> Rest element [#rest-element] <h2> Map [#map] <h2> Record [#record] <h2> Object [#object] <h2> Wildcard [#wildcard]	17	0	/language/pattern-types
<h1> C interop using dart:ffi [#document-title] <h2> Download example files [#download-example-files] <h3> Review the hello_world example [#review-the-hello_world-example] <h2> Bundle and load C libraries [#bundle-and-load-c-libraries] <h2> Interface with native types [#interface-with-native-types] <h3> Can instantiate these type signature markers [#can-instantiate-these-type-signature-markers] <h3> Serve as type signature markers only [#serve-as-type-signature-markers-only] <h2> Generate FFI bindings with package:ffigen [#generate-ffi-bindings-with-package-ffigen] <h2> Build and bundle native code [#build-hooks]	9	0	/interop/c-interop
<h1> Dart's core libraries [#document-title] <h2> Library tour [#library-tour] <h2> Multi-platform libraries [#multi-platform-libraries] <h2> Native platform libraries [#native-platform-libraries] <h2> Web platform libraries [#web-platform-libraries]	5	0	/libraries
<h1> Migrate to package:web [#document-title] <h2> package:web vs dart:html [#package-web-vs-dart-html] <h2> Migrating from dart:html [#migrating-from-dart-html] <h3> Renames [#renames] <h3> Element and HTMLElement [#element-and-htmlelement] <h3> List operations [#list-operations] <h3> Common DOM manipulation examples [#common-dom-manipulation-examples] <h3> Type tests [#type-tests] <h3> Type signatures [#type-signatures] <h3> Conditional imports [#conditional-imports] <h3> Virtual dispatch and mocking [#virtual-dispatch-and-mocking] <h3> Non-native APIs [#non-native-apis] <h3> Zones [#zones] <h2> Helpers [#helpers] <h2> Examples [#examples]	15	0	/interop/js-interop/package-web
<h1> Introduction to Dart [#document-title] <h2> Hello World [#hello-world] <h2> Variables [#variables] <h2> Control flow statements [#control-flow-statements] <h2> Functions [#functions] <h2> Comments [#comments] <h2> Imports [#imports] <h2> Classes [#classes] <h2> Enums [#enums] <h2> Inheritance [#inheritance] <h2> Mixins [#mixins] <h2> Interfaces and abstract classes [#interfaces-and-abstract-classes] <h2> Async [#async] <h2> Exceptions [#exceptions] <h2> Important concepts [#important-concepts] <h2> Additional resources [#additional-resources]	16	0	/language
<h1> Build a web app with Dart [#document-title] <h2> 1. Install Dart [#install-dart] <h2> 2. Get CLI tools or an IDE (or both) [#tools] <h2> 3. Create a web app [#create] <h2> 4. Run the app [#run] <h2> 5. Add custom code to the app [#add-code] <h2> 6. Use Dart DevTools to inspect the app [#devtools] <h2> 7. Build and deploy your web app [#deploy] <h2> What next? [#what-next]	9	0	/web/get-started
<h1> Extension methods [#document-title] <h2> Overview [#overview] <h2> Using extension methods [#using-extension-methods] <h3> Static types and dynamic [#static-types-and-dynamic] <h3> API conflicts [#api-conflicts] <h2> Implementing extension methods [#implementing-extension-methods] <h3> Unnamed extensions [#unnamed-extensions] <h2> Implementing generic extensions [#implementing-generic-extensions] <h2> Resources [#resources]	9	0	/language/extension-methods
<h1> Configuring apps with compilation environment declarations [#document-title] <h2> Accessing environment declarations [#accessing-environment-declarations] <h2> Specifying environment declarations [#specifying-environment-declarations] <h3> Dart CLI [#dart-cli] <h3> Visual Studio Code [#visual-studio-code] <h3> JetBrains IDEs [#jetbrains-ides] <h3> Flutter [#flutter]	7	0	/libraries/core/environment-declarations
<h1> Error handling [#document-title] <h2> Exceptions [#exceptions] <h3> Throw [#throw] <h3> Catch [#catch] <h3> Finally [#finally] <h2> Assert [#assert]	6	0	/language/error-handling
<h1> JS types [#document-title] <h2> Type hierarchy [#type-hierarchy] <h2> Conversions [#conversions] <h2> Requirements on external declarations and Function.toJS [#requirements-on-external-declarations-and-function-tojs] <h2> Compatibility, type checks, and casts [#compatibility-type-checks-and-casts] <h2> null vs undefined [#null-vs-undefined] <h2> JSBoxedDartObject vs ExternalDartReference [#jsboxeddartobject-vs-externaldartreference]	7	0	/interop/js-interop/js-types
<h1> The Dart type system [#document-title] <h2> What is soundness? [#what-is-soundness] <h2> The benefits of soundness [#the-benefits-of-soundness] <h2> Tips for passing static analysis [#tips-for-passing-static-analysis] <h3> Use sound return types when overriding methods [#use-sound-return-types-when-overriding-methods] <h3> Use sound parameter types when overriding methods [#use-sound-parameter-types-when-overriding-methods] <h3> Don't use a dynamic list as a typed list [#dont-use-a-dynamic-list-as-a-typed-list] <h2> Runtime checks [#runtime-checks] <h3> Implicit downcasts from dynamic [#implicit-downcasts-from-dynamic] <h2> Type inference [#type-inference] <h3> Field and method inference [#field-and-method-inference] <h3> Static field inference [#static-field-inference] <h3> Local variable inference [#local-variable-inference] <h3> Type argument inference [#type-argument-inference] <h2> Substituting types [#substituting-types] <h3> Simple type assignment [#simple-type-assignment] <h3> Generic type assignment [#generic-type-assignment] <h3> Methods [#methods] <h2> Other resources [#other-resources]	19	0	/language/type-system
<h1> Dart changelog [#document-title] <h2> 3.11 <h2> 3.10 <h2> 3.9 <h2> 3.8 <h2> 3.7 <h2> 3.6 <h2> 3.5 <h2> 3.4 <h2> 3.3 <h2> 3.2 <h2> 3.1 <h2> 3.0 <h2> 2.19 <h2> 2.18 <h2> 2.17 <h2> 2.16 <h2> 2.15 <h2> 2.14 <h2> 2.13 <h2> 2.12 <h2> 2.10 <h2> 2.9 <h2> 2.8 <h2> 2.7 <h2> 2.6 <h2> 2.5 <h2> 2.4 <h2> 2.3 <h2> 2.2 <h2> 2.1 <h2> 2.0 <h3> Types of changes	33	0	/changelog
<h1> Built-in types [#document-title] <h2> Numbers [#numbers] <h2> Strings [#strings] <h2> Booleans [#booleans] <h2> Runes and grapheme clusters [#runes-and-grapheme-clusters] <h2> Symbols [#symbols]	6	0	/language/built-in-types
<h1> Web libraries and packages [#document-title] <h2> Web solutions [#web-solutions]	2	0	/web/libraries
<h1> Glossary [#document-title] <h2> AOT <h3> Related docs and resources <h2> Application package <h3> Related docs and resources <h2> Assist <h3> Related docs and resources <h2> Asynchronous <h3> Related docs and resources <h2> Bottom type <h3> Related docs and resources <h2> Callback <h3> Related docs and resources <h2> Closurization <h3> Related docs and resources <h2> Code asset <h3> Related docs and resources <h2> Combinator <h3> Related docs and resources <h2> Constant context <h3> Related docs and resources <h2> Context type <h3> Related docs and resources <h2> Dart SDK constraint <h3> Related docs and resources <h2> Definite assignment <h3> Related docs and resources <h2> Dependency <h3> Related docs and resources <h2> Dependency graph <h3> Related docs and resources <h2> Dependency source <h3> Related docs and resources <h2> Entrypoint <h3> Related docs and resources <h2> Entrypoint directory <h3> Related docs and resources <h2> Function <h3> Related docs and resources <h2> Immediate dependency <h3> Related docs and resources <h2> Immutable <h3> Related docs and resources <h2> Interop <h3> Related docs and resources <h2> Irrefutable pattern <h3> Related docs and resources <h2> Just-in-Time compilation (JIT) <h3> Related docs and resources <h2> Late <h3> Related docs and resources <h2> Library <h3> Related docs and resources <h2> Lockfile <h3> Related docs and resources <h2> Mixin application <h3> Related docs and resources <h2> Null safety <h3> Related docs and resources <h2> Obviously typed <h3> Obviously typed expressions [#obviously-typed-expressions] <h3> Related docs and resources <h2> Override inference <h3> Related docs and resources <h2> Package <h3> Related docs and resources <h2> Package uploader <h3> Related docs and resources <h2> Part file <h3> Related docs and resources <h2> Potentially non-nullable <h3> Related docs and resources <h2> Pub content hash <h3> Related docs and resources <h2> Pub system cache <h3> Related docs and resources <h2> Pub workspace <h3> Related docs and resources <h2> Public library <h3> Related docs and resources <h2> Quick fix <h3> Related docs and resources <h2> Refactor <h3> Related docs and resources <h2> Refutable pattern <h3> Related docs and resources <h2> Reified generics <h3> Related docs and resources <h2> Scope <h3> Related docs and resources <h2> Shadowing <h3> Example [#example] <h2> Sound <h3> Related docs and resources <h2> Subclass <h3> Related docs and resources <h2> Subtype <h3> Related docs and resources <h2> Top type <h3> Related docs and resources <h2> Transitive dependency <h3> Related docs and resources <h2> Tree shaking <h3> Related docs and resources <h2> Type alias <h3> Examples [#examples] <h3> Related docs and resources <h2> Variance and variance positions <h3> Related docs and resources <h2> Verified publisher <h3> Related docs and resources <h2> Version constraint <h3> Related docs and resources <h2> Wildcard <h3> Related docs and resources <h2> Zone <h3> Related docs and resources	117	0	/resources/glossary
<h1> Extension types [#document-title] <h2> Syntax [#syntax] <h3> Declaration [#declaration] <h3> Constructors [#constructors] <h3> Members [#members] <h3> Implements [#implements] <h2> Usage [#usage] <h3> 1. Provide an extended interface to an existing type [#provide-extended-interface] <h3> 2. Provide a different interface to an existing type [#provide-different-interface] <h2> Type considerations [#type-considerations]	10	0	/language/extension-types
<h1> Numbers in Dart [#document-title] <h2> Dart number representation [#dart-number-representation] <h2> Differences in behavior [#differences-in-behavior] <h3> Precision [#precision] <h3> Identity [#identity] <h3> Types and type checking [#types-and-type-checking] <h3> Bitwise operations [#bitwise-operations] <h3> String representation [#string-representation] <h2> What should you do? [#what-should-you-do]	9	0	/resources/language/number-representation
<h1> Creating streams in Dart [#document-title] <h2> Transforming an existing stream [#transforming-an-existing-stream] <h2> Creating a stream from scratch [#creating-a-stream-from-scratch] <h2> Using a StreamController [#using-a-streamcontroller] <h3> Waiting for a subscription [#waiting-for-a-subscription] <h3> Honoring the pause state [#honoring-the-pause-state] <h2> Final hints [#final-hints]	7	0	/libraries/async/creating-streams
<h1> Class modifiers for API maintainers [#document-title] <h2> The mixin modifier on classes [#the-mixin-modifier-on-classes] <h3> Migrating classes as mixins [#migrating-classes-as-mixins] <h2> Other opt-in modifiers [#other-opt-in-modifiers] <h2> The interface modifier [#the-interface-modifier] <h2> The base modifier [#the-base-modifier] <h3> Base transitivity [#base-transitivity] <h2> The final modifier [#the-final-modifier] <h2> The sealed modifier [#the-sealed-modifier] <h3> sealed versus final [#sealed-versus-final] <h2> Summary [#summary]	11	0	/language/class-modifiers-for-apis
<h1> What's new [#document-title] <h2> 3.11 release [#3-11-release] <h3> Documentation updates [#documentation-updates] <h2> 3.10 release [#3-10-release] <h3> Documentation updates [#documentation-updates] <h3> Site improvements [#site-improvements] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 3.9 release [#3-9-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.8 release [#3-8-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Site changes for dart.dev [#site-changes-for-dart-dev] <h2> 3.7 release [#3-7-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.6 release [#3-6-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.5 release [#3-5-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.4 release [#3-4-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 3.3 release [#3-3-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.2 release [#3-2-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 3.1 release [#3-1-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 3.0 release [#3-0-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h3> Videos released by the Dart team [#videos-released-by-the-dart-team] <h2> 2.19 + 3.0 alpha releases [#2-19-3-0-alpha-releases] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 2.18 release [#2-18-release] <h2> 2.17 release [#2-17-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 2.16 release [#2-16-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 2.15 release [#2-15-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h2> 2.14 release [#2-14-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 2.13 release [#2-13-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 2.12 release [#2-12-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog] <h2> 2.10 release [#2-10-release] <h3> Docs updated or added to dart.dev [#docs-updated-or-added-to-dart-dev] <h3> Articles added to the Dart blog [#articles-added-to-the-dart-blog]	55	0	/resources/whats-new
<h1> Concurrency in Dart [#document-title] <h2> Event Loop [#event-loop] <h2> Asynchronous programming [#asynchronous-programming] <h3> Futures [#futures] <h3> The async-await syntax [#the-async-await-syntax] <h3> Streams [#streams] <h2> Isolates [#isolates] <h3> The main isolate [#the-main-isolate] <h3> The isolate life cycle [#the-isolate-life-cycle] <h3> Event handling [#event-handling] <h3> Background workers [#background-workers] <h3> Using isolates [#using-isolates] <h3> Performance and isolate groups [#performance-and-isolate-groups] <h3> Limitations of isolates [#limitations-of-isolates] <h2> Concurrency on the web [#concurrency-on-the-web] <h2> Additional resources [#additional-resources]	16	0	/language/concurrency
<h1> Records [#document-title] <h2> Record syntax [#record-syntax] <h2> Record fields [#record-fields] <h2> Record types [#record-types] <h2> Record equality [#record-equality] <h2> Multiple returns [#multiple-returns] <h2> Records as simple data structures [#records-as-simple-data-structures] <h3> Records and typedefs [#records-and-typedefs]	8	0	/language/records
<h1> Loops [#document-title] <h2> For loops [#for-loops] <h2> While and do-while [#while-and-do-while] <h2> Break and continue [#break-and-continue] <h2> Labels [#labels] <h3> Labels in for loop using break [#labels-in-for-loop-using-break] <h3> Labels in for loop using continue [#labels-in-for-loop-using-continue] <h3> Labels in while loop using break [#labels-in-while-loop-using-break] <h3> Labels in while loop using continue [#labels-in-while-loop-using-continue] <h3> Labels in do-while loop using break [#labels-in-do-while-loop-using-break] <h3> Labels in do-while loop using continue [#labels-in-do-while-loop-using-continue]	11	0	/language/loops
<h1> Libraries & imports [#document-title] <h2> Using libraries [#using-libraries] <h3> Specifying a library prefix [#specifying-a-library-prefix] <h3> Importing only part of a library [#importing-only-part-of-a-library] <h3> The library directive [#library-directive] <h2> Implementing libraries [#implementing-libraries]	6	0	/language/libraries
<h1> Effective Dart: Documentation [#document-title] <h2> Comments [#comments] <h3> DO format comments like sentences [#do-format-comments-like-sentences] <h3> DON'T use block comments for documentation [#dont-use-block-comments-for-documentation] <h2> Doc comments [#doc-comments] <h3> DO use /// doc comments to document members and types [#do-use-doc-comments-to-document-members-and-types] <h3> PREFER writing doc comments for public APIs [#prefer-writing-doc-comments-for-public-apis] <h3> CONSIDER writing a library-level doc comment [#consider-writing-a-library-level-doc-comment] <h3> CONSIDER writing doc comments for private APIs [#consider-writing-doc-comments-for-private-apis] <h3> DO start doc comments with a single-sentence summary [#do-start-doc-comments-with-a-single-sentence-summary] <h3> DO separate the first sentence of a doc comment into its own paragraph [#do-separate-the-first-sentence-of-a-doc-comment-into-its-own-paragraph] <h3> AVOID redundancy with the surrounding context [#avoid-redundancy-with-the-surrounding-context] <h3> PREFER starting comments of a function or method with third-person verbs if its main purpose is a side effect [#prefer-starting-comments-of-a-function-or-method-with-third-person-verbs-if-its-main-purpose-is-a-side-effect] <h3> PREFER starting a non-boolean variable or property comment with a noun phrase [#prefer-starting-a-non-boolean-variable-or-property-comment-with-a-noun-phrase] <h3> PREFER starting a boolean variable or property comment with "Whether" followed by a noun or gerund phrase [#prefer-starting-a-boolean-variable-or-property-comment-with-whether-followed-by-a-noun-or-gerund-phrase] <h3> PREFER a noun phrase or non-imperative verb phrase for a function or method if returning a value is its primary purpose [#prefer-a-noun-phrase-or-non-imperative-verb-phrase-for-a-function-or-method-if-returning-a-value-is-its-primary-purpose] <h3> DON'T write documentation for both the getter and setter of a property [#dont-write-documentation-for-both-the-getter-and-setter-of-a-property] <h3> PREFER starting library or type comments with noun phrases [#prefer-starting-library-or-type-comments-with-noun-phrases] <h3> CONSIDER including code samples in doc comments [#consider-including-code-samples-in-doc-comments] <h3> DO use square brackets in doc comments to refer to in-scope identifiers [#do-use-square-brackets-in-doc-comments-to-refer-to-in-scope-identifiers] <h3> DO use prose to explain parameters, return values, and exceptions [#do-use-prose-to-explain-parameters-return-values-and-exceptions] <h3> DO put doc comments before metadata annotations [#do-put-doc-comments-before-metadata-annotations] <h2> Markdown [#markdown] <h3> AVOID using markdown excessively [#avoid-using-markdown-excessively] <h3> AVOID using HTML for formatting [#avoid-using-html-for-formatting] <h3> PREFER backtick fences for code blocks [#prefer-backtick-fences-for-code-blocks] <h2> Writing [#writing] <h3> PREFER brevity [#prefer-brevity] <h3> AVOID abbreviations and acronyms unless they are obvious [#avoid-abbreviations-and-acronyms-unless-they-are-obvious] <h3> PREFER using "this" instead of "the" to refer to a member's instance [#prefer-using-this-instead-of-the-to-refer-to-a-members-instance]	30	0	/effective-dart/documentation
<h1> Class modifiers [#document-title] <h2> No modifier [#no-modifier] <h2> abstract [#abstract] <h2> base [#base] <h2> interface [#interface] <h3> abstract interface [#abstract-interface] <h2> final [#final] <h2> sealed [#sealed] <h2> Combining modifiers [#combining-modifiers]	9	0	/language/class-modifiers
<h1> Effective Dart: Design [#document-title] <h2> Names [#names] <h3> DO use terms consistently [#do-use-terms-consistently] <h3> AVOID abbreviations [#avoid-abbreviations] <h3> PREFER putting the most descriptive noun last [#prefer-putting-the-most-descriptive-noun-last] <h3> CONSIDER making the code read like a sentence [#consider-making-the-code-read-like-a-sentence] <h3> PREFER a noun phrase for a non-boolean property or variable [#prefer-a-noun-phrase-for-a-non-boolean-property-or-variable] <h3> PREFER a non-imperative verb phrase for a boolean property or variable [#prefer-a-non-imperative-verb-phrase-for-a-boolean-property-or-variable] <h3> CONSIDER omitting the verb for a named boolean parameter [#consider-omitting-the-verb-for-a-named-boolean-parameter] <h3> PREFER the "positive" name for a boolean property or variable [#prefer-the-positive-name-for-a-boolean-property-or-variable] <h3> PREFER an imperative verb phrase for a function or method whose main purpose is a side effect [#prefer-an-imperative-verb-phrase-for-a-function-or-method-whose-main-purpose-is-a-side-effect] <h3> PREFER a noun phrase or non-imperative verb phrase for a function or method if returning a value is its primary purpose [#prefer-a-noun-phrase-or-non-imperative-verb-phrase-for-a-function-or-method-if-returning-a-value-is-its-primary-purpose] <h3> CONSIDER an imperative verb phrase for a function or method if you want to draw attention to the work it performs [#consider-an-imperative-verb-phrase-for-a-function-or-method-if-you-want-to-draw-attention-to-the-work-it-performs] <h3> AVOID starting a method name with get [#avoid-starting-a-method-name-with-get] <h3> PREFER naming a method to___() if it copies the object's state to a new object [#prefer-naming-a-method-to___-if-it-copies-the-objects-state-to-a-new-object] <h3> PREFER naming a method as___() if it returns a different representation backed by the original object [#prefer-naming-a-method-as___-if-it-returns-a-different-representation-backed-by-the-original-object] <h3> AVOID describing the parameters in the function's or method's name [#avoid-describing-the-parameters-in-the-functions-or-methods-name] <h3> DO follow existing mnemonic conventions when naming type parameters [#do-follow-existing-mnemonic-conventions-when-naming-type-parameters] <h2> Libraries [#libraries] <h3> PREFER making declarations private [#prefer-making-declarations-private] <h3> CONSIDER declaring multiple classes in the same library [#consider-declaring-multiple-classes-in-the-same-library] <h2> Classes and mixins [#classes-and-mixins] <h3> AVOID defining a one-member abstract class when a simple function will do [#avoid-defining-a-one-member-abstract-class-when-a-simple-function-will-do] <h3> AVOID defining a class that contains only static members [#avoid-defining-a-class-that-contains-only-static-members] <h3> AVOID extending a class that isn't intended to be subclassed [#avoid-extending-a-class-that-isnt-intended-to-be-subclassed] <h3> DO use class modifiers to control if your class can be extended [#do-use-class-modifiers-to-control-if-your-class-can-be-extended] <h3> AVOID implementing a class that isn't intended to be an interface [#avoid-implementing-a-class-that-isnt-intended-to-be-an-interface] <h3> DO use class modifiers to control if your class can be an interface [#do-use-class-modifiers-to-control-if-your-class-can-be-an-interface] <h3> PREFER defining a pure mixin or pure class to a mixin class [#prefer-defining-a-pure-mixin-or-pure-class-to-a-mixin-class] <h2> Constructors [#constructors] <h3> CONSIDER making your constructor const if the class supports it [#consider-making-your-constructor-const-if-the-class-supports-it] <h2> Members [#members] <h3> PREFER making fields and top-level variables final [#prefer-making-fields-and-top-level-variables-final] <h3> DO use getters for operations that conceptually access properties [#do-use-getters-for-operations-that-conceptually-access-properties] <h3> DO use setters for operations that conceptually change properties [#do-use-setters-for-operations-that-conceptually-change-properties] <h3> DON'T define a setter without a corresponding getter [#dont-define-a-setter-without-a-corresponding-getter] <h3> AVOID using runtime type tests to fake overloading [#avoid-using-runtime-type-tests-to-fake-overloading] <h3> AVOID public late final fields without initializers [#avoid-public-late-final-fields-without-initializers] <h3> AVOID returning nullable Future, Stream, and collection types [#avoid-returning-nullable-future-stream-and-collection-types] <h3> AVOID returning this from methods just to enable a fluent interface [#avoid-returning-this-from-methods-just-to-enable-a-fluent-interface] <h2> Types [#types] <h3> DO type annotate variables without initializers [#do-type-annotate-variables-without-initializers] <h3> DO type annotate fields and top-level variables if the type isn't obvious [#do-type-annotate-fields-and-top-level-variables-if-the-type-isnt-obvious] <h3> DON'T redundantly type annotate initialized local variables [#dont-redundantly-type-annotate-initialized-local-variables] <h3> DO annotate return types on function declarations [#do-annotate-return-types-on-function-declarations] <h3> DO annotate parameter types on function declarations [#do-annotate-parameter-types-on-function-declarations] <h3> DON'T annotate inferred parameter types on function expressions [#dont-annotate-inferred-parameter-types-on-function-expressions] <h3> DON'T type annotate initializing formals [#dont-type-annotate-initializing-formals] <h3> DO write type arguments on generic invocations that aren't inferred [#do-write-type-arguments-on-generic-invocations-that-arent-inferred] <h3> DON'T write type arguments on generic invocations that are inferred [#dont-write-type-arguments-on-generic-invocations-that-are-inferred] <h3> AVOID writing incomplete generic types [#avoid-writing-incomplete-generic-types] <h3> DO annotate with dynamic instead of letting inference fail [#do-annotate-with-dynamic-instead-of-letting-inference-fail] <h3> PREFER signatures in function type annotations [#prefer-signatures-in-function-type-annotations] <h3> DON'T specify a return type for a setter [#dont-specify-a-return-type-for-a-setter] <h3> DON'T use the legacy typedef syntax [#dont-use-the-legacy-typedef-syntax] <h3> PREFER inline function types over typedefs [#prefer-inline-function-types-over-typedefs] <h3> PREFER using function type syntax for parameters [#prefer-using-function-type-syntax-for-parameters] <h3> AVOID using dynamic unless you want to disable static checking [#avoid-using-dynamic-unless-you-want-to-disable-static-checking] <h3> DO use Future<void> as the return type of asynchronous members that do not produce values [#do-use-futurevoid-as-the-return-type-of-asynchronous-members-that-do-not-produce-values] <h3> AVOID using FutureOr<T> as a return type [#avoid-using-futureort-as-a-return-type] <h2> Parameters [#parameters] <h3> AVOID positional boolean parameters [#avoid-positional-boolean-parameters] <h3> AVOID optional positional parameters if the user may want to omit earlier parameters [#avoid-optional-positional-parameters-if-the-user-may-want-to-omit-earlier-parameters] <h3> AVOID mandatory parameters that accept a special "no argument" value [#avoid-mandatory-parameters-that-accept-a-special-no-argument-value] <h3> DO use inclusive start and exclusive end parameters to accept a range [#do-use-inclusive-start-and-exclusive-end-parameters-to-accept-a-range] <h2> Equality [#equality] <h3> DO override hashCode if you override == [#do-override-hashcode-if-you-override] <h3> DO make your == operator obey the mathematical rules of equality [#do-make-your-operator-obey-the-mathematical-rules-of-equality] <h3> AVOID defining custom equality for mutable classes [#avoid-defining-custom-equality-for-mutable-classes] <h3> DON'T make the parameter to == nullable [#dont-make-the-parameter-to-nullable]	70	0	/effective-dart/design
<h1> Learn Dart [#document-title] <h2> Learn Dart [#learn-dart] <h2> Learn Dart and Flutter together [#learn-dart-and-flutter-together]	3	0	/learn
<h1> Command-line and server apps [#document-title] <h2> Tools [#tools] <h2> Frameworks [#frameworks] <h2> Samples [#samples] <h2> More resources [#more-resources]	5	0	/server
<h1> Past JS interop [#document-title] <h2> The evolution of JavaScript interop [#next-generation-js-interop] <h2> dart:js [#dart-js] <h2> package:js [#package-js] <h3> @staticInterop [#staticinterop] <h2> dart:js_util [#dart-js_util]	6	0	/interop/js-interop/past-js-interop
<h1> JS interop usage [#document-title] <h2> Interop types [#interop-types] <h2> Interop members [#interop-members] <h3> Top-level interop members [#top-level-interop-members] <h3> Interop type members [#interop-type-members] <h3> Extension members on interop types [#extension-members-on-interop-types] <h3> Parameters [#parameters] <h2> @JS() [#js] <h2> Export Dart functions and objects to JS [#export] <h2> dart:js_interop and dart:js_interop_unsafe [#dart-js_interop-and-dart-js_interop_unsafe]	10	0	/interop/js-interop/usage
<h1> Dart language specification [#document-title] <h2> Dart 3 [#dart-3] <h2> Dart 2 [#dart-2] <h2> Dart 1.x [#dart-1-x]	4	0	/resources/language/spec
<h1> dart:async [#document-title] <h2> Future [#future] <h3> Using await [#using-await] <h3> Basic usage [#basic-usage] <h3> Chaining multiple asynchronous methods [#chaining-multiple-asynchronous-methods] <h3> Waiting for multiple futures [#waiting-for-multiple-futures] <h3> Handling errors for multiple futures [#handling-errors-for-multiple-futures] <h2> Stream [#stream] <h3> Using an asynchronous for loop [#using-an-asynchronous-for-loop] <h3> Listening for stream data [#listening-for-stream-data] <h3> Transforming stream data [#transforming-stream-data] <h3> Handling errors and completion [#handling-errors-and-completion] <h2> More information [#more-information]	13	0	/libraries/dart-async
<h1> Extend a class [#document-title] <h2> Overriding members [#overriding-members] <h2> noSuchMethod() [#nosuchmethod]	3	0	/language/extend
<h1> Iterable collections [#document-title] <h2> What are collections? [#what-are-collections] <h2> What is an Iterable? [#what-is-an-iterable] <h2> Reading elements [#reading-elements] <h3> Example: Using a for-in loop [#example-using-a-for-in-loop] <h3> Example: Using first and last [#example-using-first-and-last] <h3> Example: Using firstWhere() [#example-using-firstwhere] <h3> Exercise: Practice writing a test predicate [#exercise-practice-writing-a-test-predicate] <h2> Checking conditions [#checking-conditions] <h3> Example: Using any() and every() [#example-using-any-and-every] <h3> Exercise: Verify that an Iterable satisfies a condition [#exercise-verify-that-an-iterable-satisfies-a-condition] <h2> Filtering [#filtering] <h3> Example: Using where() [#example-using-where] <h3> Example: Using takeWhile [#example-using-takewhile] <h3> Exercise: Filtering elements from a list [#exercise-filtering-elements-from-a-list] <h2> Mapping [#mapping] <h3> Example: Using map to change elements [#example-using-map-to-change-elements] <h3> Exercise: Mapping to a different type [#exercise-mapping-to-a-different-type] <h2> Exercise: Putting it all together [#exercise-putting-it-all-together] <h2> What's next [#whats-next]	20	0	/libraries/collections/iterables
<h1> Constructors [#document-title] <h2> Types of constructors [#types-of-constructors] <h3> Generative constructors [#generative-constructors] <h3> Default constructors [#default-constructors] <h3> Named constructors [#named-constructors] <h3> Constant constructors [#constant-constructors] <h3> Redirecting constructors [#redirecting-constructors] <h3> Factory constructors [#factory-constructors] <h3> Redirecting factory constructors [#redirecting-factory-constructors] <h3> Constructor tear-offs [#constructor-tear-offs] <h2> Instance variable initialization [#instance-variable-initialization] <h3> Initialize instance variables in the declaration [#initialize-instance-variables-in-the-declaration] <h3> Use initializing formal parameters [#use-initializing-formal-parameters] <h3> Use an initializer list [#use-an-initializer-list] <h2> Constructor inheritance [#constructor-inheritance] <h3> Non-default superclass constructors [#non-default-superclass-constructors] <h3> Super parameters [#super-parameters]	17	0	/language/constructors
<h1> Dart videos [#document-title] <h2> Dart videos from Google [#dart-videos-from-google] <h2> Dart training course in Brazilian Portuguese [#dart-training-course-in-brazilian-portuguese]	3	0	/resources/videos
<h1> Using Google Cloud [#document-title] <h2> Recommended solutions [#recommended-solutions] <h3> Cloud Run [#cloud-run] <h3> Functions Framework for Dart [#functions-framework-for-dart] <h2> Other solutions [#other-solutions] <h3> Compute Engine [#compute-engine] <h3> Kubernetes [#kubernetes] <h3> App Engine [#app-engine]	8	0	/server/google-cloud
<h1> Typedefs [#document-title]	1	0	/language/typedefs
<h1> Get the Dart SDK [#document-title] <h2> System requirements [#system-requirements] <h2> Choose an installation option [#choose-an-installation-option] <h2> Install the Dart SDK [#install] <h3> Install using Chocolatey [#install-using-chocolatey] <h3> Change default install path [#change-default-install-path] <h3> Verify your PATH includes Dart [#verify-your-path-includes-dart] <h3> Upgrade using Chocolatey [#upgrade-using-chocolatey] <h3> Uninstall using Chocolatey [#uninstall-using-chocolatey] <h3> Install using a Linux package manager [#install-using-a-linux-package-manager] <h3> Install using the apt-get package manager [#install-using-the-apt-get-package-manager] <h3> Install as a Debian package [#install-as-a-debian-package] <h2> Upgrade the Dart SDK [#upgrade-the-dart-sdk] <h3> Upgrade using apt-get [#upgrade-using-apt-get] <h3> Upgrade using dpkg [#upgrade-using-dpkg] <h2> Uninstall the Dart SDK [#uninstall-the-dart-sdk] <h3> Uninstall using apt-get [#uninstall-using-apt-get] <h3> Uninstall using dpkg [#uninstall-using-dpkg] <h3> Install using Homebrew [#install-using-homebrew] <h3> Verify PATH includes Homebrew [#verify-path-includes-homebrew] <h3> Upgrade using Homebrew [#upgrade-using-homebrew] <h3> Switch Dart versions [#switch-dart-versions] <h3> List installed Dart versions [#list-installed-dart-versions] <h3> Uninstall using Homebrew [#uninstall-using-homebrew] <h2> Release channel reference [#release-channels] <h3> Stable channel [#stable-channel] <h3> Beta channel [#beta-channel] <h3> Dev channel [#dev-channel]	28	0	/get-dart
<h1> Futures and error handling [#document-title] <h2> The Future API and callbacks [#the-future-api-and-callbacks] <h2> Examples of using then() with catchError() [#examples-of-using-then-with-catcherror] <h3> catchError() as a comprehensive error handler [#catcherror-as-a-comprehensive-error-handler] <h3> Error handling within then() [#error-handling-within-then] <h3> Errors in the middle of a long chain [#errors-in-the-middle-of-a-long-chain] <h3> Handling specific errors [#handling-specific-errors] <h2> Async try-catch-finally using whenComplete() [#async-try-catch-finally-using-whencomplete] <h3> Completing the Future returned by whenComplete() [#completing-the-future-returned-by-whencomplete] <h3> Errors originating within whenComplete() [#errors-originating-within-whencomplete] <h2> Potential problem: failing to register error handlers early [#potential-problem-failing-to-register-error-handlers-early] <h2> Potential problem: accidentally mixing synchronous and asynchronous errors [#potential-problem-accidentally-mixing-synchronous-and-asynchronous-errors] <h3> Solution: Using Future.sync() to wrap your code [#solution-using-future-sync-to-wrap-your-code] <h2> More information [#more-information]	14	0	/libraries/async/futures-error-handling
<h1> Debugging Dart web apps [#document-title] <h2> Overview [#overview] <h2> Getting started with Dart DevTools [#using-dart-devtools] <h2> Getting command-line tool packages [#getting-command-line-tool-packages] <h2> Debugging production code [#debugging] <h3> Chrome [#dart2js-debugging-chrome] <h3> Edge [#dart2js-debugging-ie] <h3> Firefox [#dart2js-debugging-firefox] <h3> Safari [#dart2js-debugging-safari] <h2> Resources [#resources]	10	0	/web/debugging
<h1> Collections [#document-title] <h2> Lists [#lists] <h2> Sets [#sets] <h2> Maps [#maps] <h2> Collection elements [#collection-elements] <h3> Expression elements [#expression-element] <h3> Map entry elements [#map-entry-element] <h3> Null-aware elements [#null-aware-element] <h3> Spread elements [#spread-element] <h3> Null-aware spread elements [#null-spread-element] <h3> If elements [#if-element] <h3> For elements [#for-element] <h3> Nest control flow elements [#nesting-elements]	13	0	/language/collections
<h1> Fetch data from the internet [#document-title] <h2> Background concepts [#background-concepts] <h3> JSON [#json] <h3> HTTP requests [#http-requests] <h3> URIs and URLs [#uris-and-urls] <h2> Retrieve the necessary dependencies [#retrieve-the-necessary-dependencies] <h2> Build a URL [#build-a-url] <h2> Make a network request [#make-a-network-request] <h3> Make multiple requests [#make-multiple-requests] <h2> Decode the retrieved data [#decode-the-retrieved-data] <h3> Create a structured class to store the data [#create-a-structured-class-to-store-the-data] <h3> Encode the data into your class [#encode-the-data-into-your-class] <h3> Convert the response to an object of your structured class [#convert-the-response-to-an-object-of-your-structured-class] <h2> Utilize the converted data [#utilize-the-converted-data] <h2> What next? [#what-next]	15	0	/server/fetch-data
<h1> Class modifiers reference [#document-title] <h2> Valid combinations [#valid-combinations] <h2> Invalid combinations [#invalid-combinations]	3	0	/language/modifier-reference
<h1> Asynchronous programming: Streams [#document-title] <h2> Receiving stream events [#receiving-stream-events] <h2> Error events [#error-events] <h2> Working with streams [#working-with-streams] <h2> Two kinds of streams [#two-kinds-of-streams] <h3> Single subscription streams [#single-subscription-streams] <h3> Broadcast streams [#broadcast-streams] <h2> Methods that process a stream [#process-stream-methods] <h2> Methods that modify a stream [#modify-stream-methods] <h3> The transform() function [#transform-function] <h3> Reading and decoding a file [#reading-decoding-file] <h2> The listen() method [#listen-method] <h2> Other resources [#other-resources]	13	0	/libraries/async/using-streams
<h1> Language versioning [#document-title] <h2> Overview [#overview] <h2> Language version numbers [#language-version-numbers] <h2> Per-library language version selection [#library-override] <h2> Language-versioned changes [#language-versioned-changes]	5	0	/language/versioning
<h1> dart:math [#document-title] <h2> Trigonometry [#trigonometry] <h2> Maximum and minimum [#maximum-and-minimum] <h2> Math constants [#math-constants] <h2> Random numbers [#random-numbers] <h2> More information [#more-information]	6	0	/libraries/dart-math
<h1> Keywords [#document-title]	1	0	/language/keywords
<h1> Using JSON [#document-title] <h2> Libraries [#libraries] <h2> Flutter resources [#flutter-resources] <h2> Web app resources [#web-app-resources]	4	0	/libraries/serialization/json
<h1> Effective Dart: Usage [#document-title] <h2> Libraries [#libraries] <h3> DO use strings in part of directives [#do-use-strings-in-part-of-directives] <h3> DON'T import libraries that are inside the src directory of another package [#dont-import-libraries-that-are-inside-the-src-directory-of-another-package] <h3> DON'T allow an import path to reach into or out of lib [#dont-allow-an-import-path-to-reach-into-or-out-of-lib] <h3> PREFER relative import paths [#prefer-relative-import-paths] <h2> Null [#null] <h3> DON'T explicitly initialize variables to null [#dont-explicitly-initialize-variables-to-null] <h3> DON'T use an explicit default value of null [#dont-use-an-explicit-default-value-of-null] <h3> DON'T use true or false in equality operations [#dont-use-true-or-false-in-equality-operations] <h3> AVOID late variables if you need to check whether they are initialized [#avoid-late-variables-if-you-need-to-check-whether-they-are-initialized] <h3> CONSIDER type promotion or null-check patterns for using nullable types [#consider-type-promotion-or-null-check-patterns-for-using-nullable-types] <h2> Strings [#strings] <h3> DO use adjacent strings to concatenate string literals [#do-use-adjacent-strings-to-concatenate-string-literals] <h3> PREFER using interpolation to compose strings and values [#prefer-using-interpolation-to-compose-strings-and-values] <h3> AVOID using curly braces in interpolation when not needed [#avoid-using-curly-braces-in-interpolation-when-not-needed] <h2> Collections [#collections] <h3> DO use collection literals when possible [#do-use-collection-literals-when-possible] <h3> DON'T use .length to see if a collection is empty [#dont-use-length-to-see-if-a-collection-is-empty] <h3> AVOID using Iterable.forEach() with a function literal [#avoid-using-iterable-foreach-with-a-function-literal] <h3> DON'T use List.from() unless you intend to change the type of the result [#dont-use-list-from-unless-you-intend-to-change-the-type-of-the-result] <h3> DO use whereType() to filter a collection by type [#do-use-wheretype-to-filter-a-collection-by-type] <h3> DON'T use cast() when a nearby operation will do [#dont-use-cast-when-a-nearby-operation-will-do] <h3> AVOID using cast() [#avoid-using-cast] <h2> Functions [#functions] <h3> DO use a function declaration to bind a function to a name [#do-use-a-function-declaration-to-bind-a-function-to-a-name] <h3> DON'T create a lambda when a tear-off will do [#dont-create-a-lambda-when-a-tear-off-will-do] <h2> Variables [#variables] <h3> DO follow a consistent rule for var and final on local variables [#do-follow-a-consistent-rule-for-var-and-final-on-local-variables] <h3> AVOID storing what you can calculate [#avoid-storing-what-you-can-calculate] <h2> Members [#members] <h3> DON'T wrap a field in a getter and setter unnecessarily [#dont-wrap-a-field-in-a-getter-and-setter-unnecessarily] <h3> PREFER using a final field to make a read-only property [#prefer-using-a-final-field-to-make-a-read-only-property] <h3> CONSIDER using => for simple members [#consider-using-for-simple-members] <h3> DON'T use this. except to redirect to a named constructor or to avoid shadowing [#dont-use-this-when-not-needed-to-avoid-shadowing] <h3> DO initialize fields at their declaration when possible [#do-initialize-fields-at-their-declaration-when-possible] <h2> Constructors [#constructors] <h3> DO use initializing formals when possible [#do-use-initializing-formals-when-possible] <h3> DON'T use late when a constructor initializer list will do [#dont-use-late-when-a-constructor-initializer-list-will-do] <h3> DO use ; instead of {} for empty constructor bodies [#do-use-instead-of-for-empty-constructor-bodies] <h3> DON'T use new [#dont-use-new] <h3> DON'T use const redundantly [#dont-use-const-redundantly] <h2> Error handling [#error-handling] <h3> AVOID catches without on clauses [#avoid-catches-without-on-clauses] <h3> DON'T discard errors from catches without on clauses [#dont-discard-errors-from-catches-without-on-clauses] <h3> DO throw objects that implement Error only for programmatic errors [#do-throw-objects-that-implement-error-only-for-programmatic-errors] <h3> DON'T explicitly catch Error or types that implement it [#dont-explicitly-catch-error-or-types-that-implement-it] <h3> DO use rethrow to rethrow a caught exception [#do-use-rethrow-to-rethrow-a-caught-exception] <h2> Asynchrony [#asynchrony] <h3> PREFER async/await over using raw futures [#prefer-asyncawait-over-using-raw-futures] <h3> DON'T use async when it has no useful effect [#dont-use-async-when-it-has-no-useful-effect] <h3> CONSIDER using higher-order methods to transform a stream [#consider-using-higher-order-methods-to-transform-a-stream] <h3> AVOID using Completer directly [#avoid-using-completer-directly] <h3> DO test for Future<T> when disambiguating a FutureOr<T> whose type argument could be Object [#do-test-for-futuret-when-disambiguating-a-futureort-whose-type-argument-could-be-object]	54	0	/effective-dart/usage
<h1> Callable objects [#document-title]	1	0	/language/callable-objects
<h1> Variables [#document-title] <h2> Null safety [#null-safety] <h2> Default value [#default-value] <h2> Late variables [#late-variables] <h2> Final and const [#final-and-const] <h2> Wildcard variables [#wildcard-variables]	6	0	/language/variables
<h1> Isolates [#document-title] <h2> Implementing a simple worker isolate [#implementing-a-simple-worker-isolate] <h3> Running an existing method in a new isolate [#running-an-existing-method-in-a-new-isolate] <h3> Sending closures with isolates [#sending-closures-with-isolates] <h2> Sending multiple messages between isolates with ports [#sending-multiple-messages-between-isolates-with-ports] <h3> ReceivePort and SendPort [#receiveport-and-sendport] <h3> Basic ports example [#basic-ports-example] <h3> Robust ports example [#robust-ports-example]	8	0	/language/isolates
<h1> Operators [#document-title] <h2> Operator precedence example [#operator-precedence-example] <h2> Arithmetic operators [#arithmetic-operators] <h2> Equality and relational operators [#equality-and-relational-operators] <h2> Type test operators [#type-test-operators] <h2> Assignment operators [#assignment-operators] <h2> Logical operators [#logical-operators] <h2> Bitwise and shift operators [#bitwise-and-shift-operators] <h2> Conditional expressions [#conditional-expressions] <h2> Cascade notation [#cascade-notation] <h2> Spread operators [#spread-operators] <h2> Other operators [#other-operators]	12	0	/language/operators
<h1> Comments [#document-title] <h2> Single-line comments [#single-line-comments] <h2> Multi-line comments [#multi-line-comments] <h2> Documentation comments [#documentation-comments]	4	0	/language/comments
<h1> Effective Dart [#document-title] <h2> The guides [#the-guides] <h2> How to read the guides [#how-to-read-the-guides] <h2> Glossary [#glossary] <h2> Summary of all rules [#summary-of-all-rules] <h3> Style [#style] <h3> Documentation [#documentation] <h3> Usage [#usage] <h3> Design [#design]	9	0	/effective-dart
<h1> Objective-C and Swift interop using package:ffigen [#document-title] <h2> Objective-C example [#objective-c-example] <h3> Configure FFIgen for Objective-C [#configure-ffigen-for-objective-c] <h3> Generate the Objective-C bindings [#generate-the-objective-c-bindings] <h3> Use the Objective-C bindings [#use-the-objective-c-bindings] <h3> Callbacks and multithreading limitations [#callbacks-and-multithreading-limitations] <h2> Swift example [#swift-example] <h3> Generating the Objective-C wrapper header [#generating-the-objective-c-wrapper-header] <h3> Configuring FFIgen for Swift [#configuring-ffigen-for-swift] <h3> Generating the Swift bindings [#generating-the-swift-bindings] <h3> Using the Swift bindings [#using-the-swift-bindings]	11	0	/interop/objective-c-interop
<h1> Understanding null safety [#document-title] <h2> Nullability in the type system [#nullability-in-the-type-system] <h3> Non-nullable and nullable types [#non-nullable-and-nullable-types] <h3> Using nullable types [#using-nullable-types] <h3> Top and bottom [#top-and-bottom] <h2> Ensuring correctness [#ensuring-correctness] <h3> Invalid returns [#invalid-returns] <h3> Uninitialized variables [#uninitialized-variables] <h2> Flow analysis [#flow-analysis] <h3> Reachability analysis [#reachability-analysis] <h3> Never for unreachable code [#never-for-unreachable-code] <h3> Definite assignment analysis [#definite-assignment-analysis] <h3> Type promotion on null checks [#type-promotion-on-null-checks] <h3> Unnecessary code warnings [#unnecessary-code-warnings] <h2> Working with nullable types [#working-with-nullable-types] <h3> Smarter null-aware methods [#smarter-null-aware-methods] <h3> Not-null assertion operator [#not-null-assertion-operator] <h3> Late variables [#late-variables] <h3> Lazy initialization [#lazy-initialization] <h3> Late final variables [#late-final-variables] <h3> Required named parameters [#required-named-parameters] <h3> Abstract fields [#abstract-fields] <h3> Working with nullable fields [#working-with-nullable-fields] <h3> Nullability and generics [#nullability-and-generics] <h2> Core library changes [#core-library-changes] <h3> The Map index operator is nullable [#the-map-index-operator-is-nullable] <h3> No unnamed List constructor [#no-unnamed-list-constructor] <h3> Cannot set a larger length on non-nullable lists [#cannot-set-a-larger-length-on-non-nullable-lists] <h3> Cannot access Iterator.current before or after iteration [#cannot-access-iterator-current-before-or-after-iteration] <h2> Summary [#summary]	30	0	/null-safety/understanding-null-safety
<h1> Command-line and server libraries and packages [#document-title] <h2> SDK libraries [#sdk-libraries] <h2> Community packages [#community-packages] <h3> Command-line packages [#command-line-packages] <h3> Server packages [#server-packages]	5	0	/server/libraries
<h1> Web deployment [#document-title] <h2> Building your app [#compiling-to-javascript] <h3> Compile using webdev [#compile-using-webdev] <h3> Make your app smaller, faster, and more reliable [#make-your-app-smaller-faster-and-more-reliable] <h2> Serving your app [#serving-your-app] <h3> GitHub Pages [#github-pages] <h3> Firebase [#firebase]	7	0	/web/deployment
<h1> Commonly used packages [#document-title] <h2> General-purpose packages [#general-purpose-packages] <h2> Packages that expand on Dart core libraries [#packages-that-correspond-to-sdk-libraries] <h2> Specialized packages [#specialized-packages] <h3> Flutter packages [#flutter-packages] <h3> Web packages [#web-packages] <h3> Command-line and server packages [#command-line-and-server-packages]	7	0	/resources/useful-packages
<h1> Java interop using package:jnigen [#document-title] <h2> Simple Java example [#simple-java-example] <h3> Prerequisites [#prerequisites] <h3> Configure jnigen [#configure-jnigen] <h3> Generate the Dart bindings [#generate-the-dart-bindings] <h3> Use the bindings [#use-the-bindings] <h3> Run the example [#run-the-example] <h2> More examples [#more-examples]	8	0	/interop/java-interop
<h1> Multi-platform apps [#document-title]	1	0	/multiplatform-apps
<h1> Patterns [#document-title] <h2> What patterns do [#what-patterns-do] <h3> Matching [#matching] <h3> Destructuring [#destructuring] <h2> Places patterns can appear [#places-patterns-can-appear] <h3> Variable declaration [#variable-declaration] <h3> Variable assignment [#variable-assignment] <h3> Switch statements and expressions [#switch-statements-and-expressions] <h3> For and for-in loops [#for-and-for-in-loops] <h2> Use cases for patterns [#use-cases-for-patterns] <h3> Destructuring multiple returns [#destructuring-multiple-returns] <h3> Destructuring class instances [#destructuring-class-instances] <h3> Algebraic data types [#algebraic-data-types] <h3> Validating incoming JSON [#validating-incoming-json]	14	0	/language/patterns
<h1> Effective Dart: Style [#document-title] <h2> Identifiers [#identifiers] <h3> DO name types using UpperCamelCase [#do-name-types-using-uppercamelcase] <h3> DO name extensions using UpperCamelCase [#do-name-extensions-using-uppercamelcase] <h3> DO name packages, directories, and source files using lowercase_with_underscores [#do-name-packages-and-file-system-entities-using-lowercase-with-underscores] <h3> DO name import prefixes using lowercase_with_underscores [#do-name-import-prefixes-using-lowercase_with_underscores] <h3> DO name other identifiers using lowerCamelCase [#do-name-other-identifiers-using-lowercamelcase] <h3> PREFER using lowerCamelCase for constant names [#prefer-using-lowercamelcase-for-constant-names] <h3> DO capitalize acronyms and abbreviations longer than two letters like words [#do-capitalize-acronyms-and-abbreviations-longer-than-two-letters-like-words] <h3> PREFER using wildcards for unused callback parameters [#prefer-using-wildcards-for-unused-callback-parameters] <h3> DON'T use a leading underscore for identifiers that aren't private [#dont-use-a-leading-underscore-for-identifiers-that-arent-private] <h3> DON'T use prefix letters [#dont-use-prefix-letters] <h3> DON'T explicitly name libraries [#dont-explicitly-name-libraries] <h2> Ordering [#ordering] <h3> DO place dart: imports before other imports [#do-place-dart-imports-before-other-imports] <h3> DO place package: imports before relative imports [#do-place-package-imports-before-relative-imports] <h3> DO specify exports in a separate section after all imports [#do-specify-exports-in-a-separate-section-after-all-imports] <h3> DO sort sections alphabetically [#do-sort-sections-alphabetically] <h2> Formatting [#formatting] <h3> DO format your code using dart format [#do-format-your-code-using-dart-format] <h3> CONSIDER changing your code to make it more formatter-friendly [#consider-changing-your-code-to-make-it-more-formatter-friendly] <h3> PREFER lines 80 characters or fewer [#prefer-lines-80-characters-or-fewer] <h3> DO use curly braces for all flow control statements [#do-use-curly-braces-for-all-flow-control-statements]	23	0	/effective-dart/style
<h1> JS interop tutorials [#document-title] <h2> Tutorials [#tutorials] <h3> Getting started with Javascript interop [#getting-started-with-javascript-interop] <h3> How to mock JavaScript interop in Dart [#how-to-mock-javascript-interop-in-dart]	4	0	/interop/js-interop/tutorials
<h1> Methods [#document-title] <h2> Instance methods [#instance-methods] <h2> Operators [#operators] <h2> Getters and setters [#getters-and-setters] <h2> Abstract methods [#abstract-methods]	5	0	/language/methods
<h1> dart:io [#document-title] <h2> Files and directories [#files-and-directories] <h3> Reading a file as text [#reading-a-file-as-text] <h3> Reading a file as binary [#reading-a-file-as-binary] <h3> Handling errors [#handling-errors] <h3> Streaming file contents [#streaming-file-contents] <h3> Writing file contents [#writing-file-contents] <h3> Listing files in a directory [#listing-files-in-a-directory] <h3> Other common functionality [#other-common-functionality] <h2> HTTP clients and servers [#http-clients-and-servers] <h3> HTTP server [#http-server] <h3> HTTP client [#http-client] <h2> More information [#more-information]	13	0	/libraries/dart-io
<h1> Using Google APIs [#document-title] <h2> Firebase [#firebase] <h2> Google client APIs [#google-client-apis]	3	0	/resources/google-apis
<h1> Metadata [#document-title] <h2> Built-in annotations [#built-in-annotations] <h2> Analyzer-supported annotations [#analyzer-supported-annotations] <h2> Custom annotations [#custom-annotations] <h3> Specifying supported targets [#specifying-supported-targets]	5	0	/language/metadata
<h1> Search dart.dev [#document-title]	1	0	/search
<h1> Dart cheatsheet [#document-title] <h2> String interpolation [#string-interpolation] <h3> Exercise [#exercise] <h2> Nullable variables [#nullable-variables] <h3> Exercise [#exercise] <h2> Null-aware operators [#null-aware-operators] <h3> Exercise [#exercise] <h2> Conditional property access [#conditional-property-access] <h3> Exercise [#exercise] <h2> Collection literals [#collection-literals] <h3> Exercise [#exercise] <h2> Arrow syntax [#arrow-syntax] <h3> Exercise [#exercise] <h2> Cascades [#cascades] <h3> Exercise [#exercise] <h2> Getters and setters [#getters-and-setters] <h3> Exercise [#exercise] <h2> Optional positional parameters [#optional-positional-parameters] <h3> Exercise [#exercise] <h2> Named parameters [#named-parameters] <h3> Exercise [#exercise] <h2> Exceptions [#exceptions] <h3> Exercise [#exercise] <h2> Using this in a constructor [#using-this-in-a-constructor] <h3> Exercise [#exercise] <h2> Initializer lists [#initializer-lists] <h3> Exercise [#exercise] <h2> Named constructors [#named-constructors] <h3> Exercise [#exercise] <h2> Factory constructors [#factory-constructors] <h3> Exercise [#exercise] <h2> Redirecting constructors [#redirecting-constructors] <h3> Exercise [#exercise] <h2> Const constructors [#const-constructors] <h3> Exercise [#exercise] <h2> What's next? [#whats-next]	36	0	/resources/dart-cheatsheet
<h1> Dart language evolution [#document-title] <h2> Changes in each release [#changes-in-each-release] <h3> Dart 3.11 [#dart-3-11] <h3> Dart 3.10 [#dart-3-10] <h3> Dart 3.9 [#dart-3-9] <h3> Dart 3.8 [#dart-3-8] <h3> Dart 3.7 [#dart-3-7] <h3> Dart 3.6 [#dart-3-6] <h3> Dart 3.5 [#dart-3-5] <h3> Dart 3.4 [#dart-3-4] <h3> Dart 3.3 [#dart-3-3] <h3> Dart 3.2 [#dart-3-2] <h3> Dart 3.1 [#dart-3-1] <h3> Dart 3.0 [#dart-3-0] <h3> Dart 2.19 [#dart-2-19] <h3> Dart 2.18 [#dart-2-18] <h3> Dart 2.17 [#dart-2-17] <h3> Dart 2.16 [#dart-2-16] <h3> Dart 2.15 [#dart-2-15] <h3> Dart 2.14 [#dart-2-14] <h3> Dart 2.13 [#dart-2-13] <h3> Dart 2.12 [#dart-2-12] <h3> Dart 2.10 [#dart-2-10] <h3> Dart 2.9 [#dart-2-9] <h3> Dart 2.8 [#dart-2-8] <h3> Dart 2.7 [#dart-2-7] <h3> Dart 2.6 [#dart-2-6] <h3> Dart 2.5 [#dart-2-5] <h3> Dart 2.4 [#dart-2-4] <h3> Dart 2.3 [#dart-2-3] <h3> Dart 2.2 [#dart-2-2] <h3> Dart 2.1 [#dart-2-1] <h3> Dart 2.0 [#dart-2-0] <h2> Language versioning [#language-versioning]	34	0	/resources/language/evolution
<h1> Resources [#document-title]	1	0	/resources
<h1> Getting started with JavaScript interop [#document-title] <h2> Access and define a JavaScript object [#access-and-define-a-javascript-object] <h2> Use automatic type conversions [#use-automatic-type-conversions] <h2> Handle events and callbacks [#handle-events-and-callbacks] <h2> Work with Promises and Arrays [#work-with-promises-and-arrays] <h3> Promises and futures [#promises-and-futures] <h3> Arrays and Lists [#arrays-and-lists] <h2> Learn more [#learn-more]	8	0	/interop/js-interop/start
<h1> Native interop with Dart [#document-title] <h2> Community interop [#community-interop]	2	0	/interop
<h1> How to mock JavaScript interop objects [#document-title] <h2> Background and motivation [#background-and-motivation] <h2> Mocking example [#mocking-example] <h2> @JSExport and createJSInteropWrapper [#jsexport-and-createjsinteropwrapper]	4	0	/interop/js-interop/mock
<h1> Dart brand guidelines [#document-title] <h2> General rules that govern the use of the Dart trademarks [#general-rules-that-govern-the-use-of-the-dart-trademarks] <h2> Specific rules for proper usage of the Dart trademarks [#specific-rules-for-proper-usage-of-the-dart-trademarks] <h2> Community use exceptions [#community-use-exceptions]	4	0	/brand
<h1> Zones [#document-title] <h2> Asynchronous dynamic extents [#asynchronous-dynamic-extents] <h2> Zone basics [#zone-basics] <h2> Handling uncaught errors [#handling-uncaught-errors] <h3> Example: Errors can't cross into error zones [#example-errors-cant-cross-into-error-zones] <h3> Example: Errors can't leave error zones [#example-errors-cant-leave-error-zones] <h2> Using zones with streams [#using-zones-with-streams] <h3> Example: Using a stream with runZonedGuarded() [#example-using-a-stream-with-runzonedguarded] <h2> Storing zone-local values [#storing-zone-local-values] <h3> Example: Using a zone-local value for debug logs [#example-using-a-zone-local-value-for-debug-logs] <h2> Overriding functionality [#overriding-functionality] <h3> Example: Overriding print [#example-overriding-print] <h3> Arguments to interceptors and delegates [#arguments-to-interceptors-and-delegates] <h3> Example: Delegating to the parent zone [#example-delegating-to-the-parent-zone] <h3> Example: Executing code when entering and leaving a zone [#example-executing-code-when-entering-and-leaving-a-zone] <h3> Example: Handling callbacks [#example-handling-callbacks] <h3> Implementing asynchronous callbacks [#implementing-asynchronous-callbacks] <h2> Summary [#summary] <h3> More resources [#more-resources] <h3> More examples [#more-examples]	20	0	/libraries/async/zones
<h1> dart:html [#document-title] <h2> Manipulating the DOM [#manipulating-the-dom] <h3> Finding elements [#finding-elements] <h3> Manipulating elements [#manipulating-elements] <h3> Creating elements [#creating-elements] <h3> Adding, replacing, and removing nodes [#adding-replacing-and-removing-nodes] <h3> Manipulating CSS styles [#manipulating-css-styles] <h3> Handling events [#handling-events] <h2> Using HTTP resources with HttpRequest [#using-http-resources-with-httprequest] <h2> Sending and receiving real-time data with WebSockets [#sending-and-receiving-real-time-data-with-websockets] <h3> Sending data [#sending-data] <h3> Receiving data [#receiving-data] <h3> Handling WebSocket events [#handling-websocket-events] <h2> More information [#more-information]	14	0	/libraries/dart-html
<h1> Breaking changes and deprecations [#document-title] <h2> 3.11.0 [#3-11-0] <h3> Tools [#tools] <h2> 3.10.0 [#3-10-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.9.0 [#3-9-0] <h3> Language [#language] <h3> Tools [#tools] <h2> 3.8.0 [#3-8-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.7.0 [#3-7-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.6.0 [#3-6-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.5.0 [#3-5-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Runtime [#runtime] <h2> 3.4.0 [#3-4-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h3> Runtime [#runtime] <h2> 3.3.0 [#3-3-0] <h3> SDK [#sdk] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.2.0 [#3-2-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 3.1.0 [#3-1-0] <h3> Libraries [#libraries] <h2> 3.0.0 [#3-0-0] <h3> Language [#language] <h3> Libraries [#libraries] <h2> 2.19.0 [#2-19-0] <h3> Language [#language] <h3> Libraries [#libraries] <h2> 2.18.0 [#2-18-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.17.0 [#2-17-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.16.0 [#2-16-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.15.0 [#2-15-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.14.0 [#2-14-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.13.0 [#2-13-0] <h3> Libraries [#libraries] <h2> 2.12.0 [#2-12-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.10.0 [#2-10-0] <h3> Tools [#tools] <h2> 2.9.0 [#2-9-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.8.1 [#2-8-1] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.7.1 [#2-7-1] <h2> 2.7.0 [#2-7-0] <h3> Language [#language] <h3> Libraries [#libraries] <h2> 2.6.0 [#2-6-0] <h3> Language [#language] <h3> Libraries [#libraries] <h2> 2.5.0 [#2-5-0] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.4.0 [#2-4-0] <h3> Language [#language] <h3> Libraries [#libraries] <h2> 2.2.0 [#2-2-0] <h3> Libraries [#libraries] <h2> 2.1.1 [#2-1-1] <h3> Libraries [#libraries] <h3> Tools [#tools] <h2> 2.1.0 [#2-1-0] <h3> Language [#language] <h3> Tools [#tools] <h2> 2.0.0 [#2-0-0] <h3> Language [#language] <h3> Libraries [#libraries] <h3> Tools [#tools]	103	0	/resources/breaking-changes
<h1> Dart SDK archive [#document-title] <h2> Stable channel [#stable-channel] <h2> Beta channel [#beta-channel] <h2> Dev channel [#dev-channel] <h2> Main channel [#main-channel] <h2> Download URLs [#download-urls] <h3> Stable, beta, and dev channel URL scheme [#stable-beta-and-dev-channel-url-scheme] <h3> Main channel URL scheme [#main-channel-url-scheme]	8	0	/get-dart/archive
<h1> Dart team packages [#document-title]	1	0	/resources/dart-team-packages
<h1> Search more sites [#document-title]	1	0	/search-all
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Not allowed host	https://api.dart.dev/dart-ffi/dart-ffi-library.html	<a href>	/interop/c-interop
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Not allowed host	https://api.dart.dev/dart-html/WebSocket-class.html	<a href>	/libraries/dart-html
Not allowed host	https://api.dart.dev/dart-html/Window-class.html	<a href>	/libraries/dart-html
Not allowed host	https://api.dart.dev/dart-html/dart-html-library.html	<a href>	/libraries
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Not allowed host	https://api.dart.dev/dart-io/HttpServer-class.html	<a href>	/libraries/dart-io
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Not allowed host	https://api.dart.dev/dart-io/WebSocket-class.html	<a href>	/libraries/dart-io
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Not allowed host	https://api.dart.dev/dart-isolate/SendPort-class.html	<a href>	/language/concurrency
Not allowed host	https://api.dart.dev/dart-isolate/SendPort/send.html	<a href>	/language/concurrency
Not allowed host	https://api.dart.dev/dart-isolate/dart-isolate-library.html	<a href>	/libraries
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Not allowed host	https://api.dart.dev/dart-js/dart-js-library.html	<a href>	/libraries
Not allowed host	https://api.dart.dev/dart-js_interop/	<a href>	/interop/js-interop
Not allowed host	https://api.dart.dev/dart-js_interop/ExternalDartReference-extension-type.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/ExternalDartReferenceToObject/toDartObject.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/FunctionToJSExportedDartFunction/toJS.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/JS-class.html	<a href>	/interop/js-interop/usage
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyOperatorExtension.html	<a href>	/interop/js-interop/usage
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension.html	<a href>	/interop/js-interop/package-web
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/dartify.html	<a href>	/interop/js-interop/usage
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/instanceOfString.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/isA.html	<a href>	/interop/js-interop/package-web
Not allowed host	https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/typeofEquals.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/JSBoxedDartObject-extension-type.html	<a href>	/interop/js-interop/js-types
Not allowed host	https://api.dart.dev/dart-js_interop/JSExport-class.html	<a href>	/interop/js-interop/usage
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External URLs

819 external URL(s)

Found 200 row(s).

External URL	Pages 🔽	Found on URL (max 5)
http://en.wikipedia.org/api/rest_v1/	1	/learn/tutorial/async
http://http//127.0.0.1:8080	1	/web/debugging
http://localhost:8080/	1	/web/get-started
https://api.dart.dev/beta/2.19.0-255.2.beta/dart-developer/UserTag/maxUserTags-constant.html	1	/changelog
https://api.dart.dev/beta/latest/dart-core/Deprecated/Deprecated.extend.html	1	/language/metadata
https://api.dart.dev/beta/latest/dart-core/Deprecated/Deprecated.implement.html	1	/language/metadata
https://api.dart.dev/beta/latest/dart-core/Deprecated/Deprecated.instantiate.html	1	/language/metadata
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https://api.dart.dev/beta/latest/dart-core/Deprecated/Deprecated.subclass.html	1	/language/metadata
https://api.dart.dev/dart-async	1	/resources/glossary
https://api.dart.dev/dart-async/BroadcastStream-class.html	1	/language/isolates
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https://api.dart.dev/dart-async/EventSink-class.html	1	/libraries/async/creating-streams
https://api.dart.dev/dart-async/Future-class.html	1	/language/async
https://api.dart.dev/dart-async/Future/then.html	1	/effective-dart/usage
https://api.dart.dev/dart-async/Future/wait.html	1	/libraries/dart-async
https://api.dart.dev/dart-async/FutureIterable/wait.html	1	/libraries/dart-async
https://api.dart.dev/dart-async/FutureRecord2/wait.html	1	/libraries/dart-async
https://api.dart.dev/dart-async/ParallelWaitError-class.html	1	/libraries/dart-async
https://api.dart.dev/dart-async/Stream-class.html	1	/language/async
https://api.dart.dev/dart-async/StreamController-class.html	1	/libraries/async/creating-streams
https://api.dart.dev/dart-async/StreamSubscription-class.html	1	/libraries/async/using-streams
https://api.dart.dev/dart-async/StreamTransformer-class.html	1	/libraries/async/creating-streams
https://api.dart.dev/dart-async/StreamTransformer/bind.html	1	/libraries/async/using-streams
https://api.dart.dev/dart-async/Zone-class.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/Zone/fork.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/Zone/runGuarded.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/ZoneDelegate-class.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/ZoneSpecification-class.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/ZoneSpecification/handleUncaughtError.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/dart-async-library.html	1	/libraries
https://api.dart.dev/dart-async/runZoned.html	1	/libraries/async/zones
https://api.dart.dev/dart-async/runZonedGuarded.html	1	/libraries/async/zones
https://api.dart.dev/dart-collection/HashMap-class.html	1	/libraries/collections/iterables
https://api.dart.dev/dart-collection/dart-collection-library.html	1	/libraries
https://api.dart.dev/dart-convert	1	/learn/tutorial/data-and-json
https://api.dart.dev/dart-convert/JsonCodec/decode.html	1	/server/fetch-data
https://api.dart.dev/dart-convert/LineSplitter-class.html	1	/libraries/async/using-streams
https://api.dart.dev/dart-convert/Utf8Decoder-class.html	1	/libraries/async/using-streams
https://api.dart.dev/dart-convert/dart-convert-library.html	1	/libraries/dart-convert
https://api.dart.dev/dart-core/ArgumentError-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/ArgumentError/toString.html	1	/libraries/async/async-await
https://api.dart.dev/dart-core/AssertionError-class.html	1	/language/error-handling
https://api.dart.dev/dart-core/BigInt-class.html	1	/resources/language/number-representation
https://api.dart.dev/dart-core/Comparable-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/DateTime-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Deprecated-class.html	1	/language/metadata
https://api.dart.dev/dart-core/Deprecated/message.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/Duration-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Enum-class.html	1	/language/enums
https://api.dart.dev/dart-core/Error-class.html	1	/libraries/async/async-await
https://api.dart.dev/dart-core/Exception-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Expando-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Finalizer-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Function-class.html	1	/language/functions
https://api.dart.dev/dart-core/Iterable-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Iterable/forEach.html	1	/language/loops
https://api.dart.dev/dart-core/Iterable/whereType.html	1	/effective-dart/usage
https://api.dart.dev/dart-core/Iterator-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/List-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/List/List.filled.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/List/List.from.html	1	/effective-dart/usage
https://api.dart.dev/dart-core/Map-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/MapEntry-class.html	1	/language/patterns
https://api.dart.dev/dart-core/Match-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/NoSuchMethodError-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/NoSuchMethodError/NoSuchMethodError.withInvocation.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/Object-class.html	1	/language/classes
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https://api.dart.dev/dart-core/Set-class.html	1	/libraries/dart-core
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https://api.dart.dev/dart-core/String-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/String/String.fromEnvironment.html	1	/libraries/core/environment-declarations
https://api.dart.dev/dart-core/StringBuffer-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Symbol-class.html	1	/language/built-in-types
https://api.dart.dev/dart-core/Type-class.html	1	/language/classes
https://api.dart.dev/dart-core/TypeError-class.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/Uri-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Uri/Uri.http.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/Uri/Uri.https.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/WeakReference-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/bool/bool.fromEnvironment.html	1	/libraries/core/environment-declarations
https://api.dart.dev/dart-core/bool/bool.hasEnvironment.html	1	/libraries/core/environment-declarations
https://api.dart.dev/dart-core/dart-core-library.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/double-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/double/parse.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/identical.html	1	/language/operators
https://api.dart.dev/dart-core/int-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/int/int.fromEnvironment.html	1	/libraries/core/environment-declarations
https://api.dart.dev/dart-core/int/parse.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/num-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/num/parse.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/num/toStringAsFixed.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/num/toStringAsPrecision.html	1	/libraries/dart-core
https://api.dart.dev/dart-core/num/tryParse.html	1	/resources/dart-3-migration
https://api.dart.dev/dart-core/override-constant.html	1	/language/metadata
https://api.dart.dev/dart-core/pragma-class.html	1	/language/metadata
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https://api.dart.dev/dart-developer/dart-developer-library.html	1	/libraries
https://api.dart.dev/dart-ffi/Abi-class.html	1	/interop/c-interop
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https://api.dart.dev/dart-ffi/DefaultAsset-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Double-class.html	1	/interop/c-interop
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https://api.dart.dev/dart-ffi/Int8-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/IntPtr-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Long-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/LongLong-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Native-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/NativeFinalizer-class.html	1	/libraries/dart-core
https://api.dart.dev/dart-ffi/NativeFunction-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/NativeType-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Opaque-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Pointer-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Short-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/SignedChar-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Size-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Struct-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Uint16-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Uint32-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Uint64-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Uint8-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UintPtr-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Union-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UnsignedChar-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UnsignedInt-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UnsignedLong-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UnsignedLongLong-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/UnsignedShort-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/Void-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/WChar-class.html	1	/interop/c-interop
https://api.dart.dev/dart-ffi/dart-ffi-library.html	1	/interop/c-interop
https://api.dart.dev/dart-html/	1	/interop/js-interop/past-js-interop
https://api.dart.dev/dart-html/AnchorElement-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/Document-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/Element-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/HttpRequest-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/MessageEvent-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/Node-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/WebSocket-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/Window-class.html	1	/libraries/dart-html
https://api.dart.dev/dart-html/dart-html-library.html	1	/libraries
https://api.dart.dev/dart-indexed_db/	1	/interop/js-interop/past-js-interop
https://api.dart.dev/dart-indexed_db/dart-indexed_db-library.html	1	/libraries
https://api.dart.dev/dart-io/Directory-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/File-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/HttpClient-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/HttpServer-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/IOSink-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/Process-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/Socket-class.html	1	/language/concurrency
https://api.dart.dev/dart-io/WebSocket-class.html	1	/libraries/dart-io
https://api.dart.dev/dart-io/dart-io-library.html	1	/libraries
https://api.dart.dev/dart-isolate/Isolate/exit.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/Isolate/run.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/Isolate/spawn.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/Isolate/spawnUri.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/RawReceivePort-class.html	1	/language/isolates
https://api.dart.dev/dart-isolate/ReceivePort-class.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/RemoteError-class.html	1	/language/isolates
https://api.dart.dev/dart-isolate/SendPort-class.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/SendPort/send.html	1	/language/concurrency
https://api.dart.dev/dart-isolate/dart-isolate-library.html	1	/libraries
https://api.dart.dev/dart-js/	1	/interop/js-interop/past-js-interop
https://api.dart.dev/dart-js/JsObject-class.html	1	/interop/js-interop/past-js-interop
https://api.dart.dev/dart-js/dart-js-library.html	1	/libraries
https://api.dart.dev/dart-js_interop/	1	/interop/js-interop
https://api.dart.dev/dart-js_interop/ExternalDartReference-extension-type.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/ExternalDartReferenceToObject/toDartObject.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/FunctionToJSExportedDartFunction/toJS.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/JS-class.html	1	/interop/js-interop/usage
https://api.dart.dev/dart-js_interop/JSAnyOperatorExtension.html	1	/interop/js-interop/usage
https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension.html	1	/interop/js-interop/package-web
https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/dartify.html	1	/interop/js-interop/usage
https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/instanceOfString.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/isA.html	1	/interop/js-interop/package-web
https://api.dart.dev/dart-js_interop/JSAnyUtilityExtension/typeofEquals.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/JSBoxedDartObject-extension-type.html	1	/interop/js-interop/js-types
https://api.dart.dev/dart-js_interop/JSExport-class.html	1	/interop/js-interop/usage
https://api.dart.dev/dart-js_interop/JSObject-extension-type.html	1	/interop/js-interop/package-web
https://api.dart.dev/dart-js_interop/NullableObjectUtilExtension/jsify.html	1	/interop/js-interop/usage
https://api.dart.dev/dart-js_interop/ObjectToExternalDartReference/toExternalReference.html	1	/interop/js-interop/js-types
You have reached the hard limit of 200 rows as a protection against very large output or exhausted memory. You can change this with `--rows-limit`.
No rows found, please edit your search term.

(+) Show entire table

TOP fastest URLs

Found 20 row(s).

Time 🔼	Status	Fast URL
8 ms	200	/learn/tutorial/first-app
8 ms	200	/language/comments
8 ms	200	/language/generics
9 ms	200	/language/class-modifiers
9 ms	200	/language/functions
9 ms	200	/language/metadata
9 ms	200	/libraries
9 ms	200	/language
9 ms	200	/
9 ms	200	/effective-dart
9 ms	200	/language/type-system
9 ms	200	/get-dart
9 ms	200	/learn/tutorial/async
10 ms	200	/docs
10 ms	200	/language/variables
10 ms	200	/overview
10 ms	200	/libraries/async/async-await
10 ms	200	/language/operators
10 ms	200	/learn/tutorial/interactivity
10 ms	200	/language/error-handling
No rows found, please edit your search term.

TOP slowest URLs

Found 20 row(s).

Time 🔽	Status	Slow URL
234 ms	200	/language/branches
204 ms	200	/libraries/collections/iterables
201 ms	200	/libraries/dart-html
193 ms	200	/language/callable-objects
190 ms	200	/language/extension-types
185 ms	200	/resources/dart-team-packages
184 ms	200	/resources/glossary
183 ms	200	/learn/tutorial
176 ms	200	/language/dot-shorthands
175 ms	200	/changelog
172 ms	200	/interop/js-interop/package-web
171 ms	200	/learn/tutorial/advanced-oop
170 ms	200	/interop/js-interop/js-types
169 ms	200	/security
167 ms	200	/language/collections
166 ms	200	/web/wasm
165 ms	200	/web
164 ms	200	/learn/tutorial/data-and-json
164 ms	200	/resources
163 ms	200	/libraries/dart-core
No rows found, please edit your search term.

Content types

Content type	URLs 🔽	Total size	Total time	Avg time	Status 20x	Status 30x
HTML	122	19 MB	14 s	121 ms	122	0
Redirect	21	2 kB	2 s	94 ms	0	21

Content types (MIME types)

Content type	URLs 🔽	Total size	Total time	Avg time	Status 20x	Status 30x
text/html; charset=utf-8	122	19 MB	14 s	121 ms	122	0
text / html	21	2 kB	2 s	94 ms	0	21

Source domains

Domain	Totals	HTML	Redirect
dart.dev	142 / 19MB / 16s	121 / 19MB / 14s	21 / 2kB / 2s
docs.flutter.dev	1 / 120kB / 113ms	1 / 120kB / 113ms

HTTP headers

Found 20 row(s).

Header 🔼	Occurs	Unique	Values preview	Min value	Max value
Accept-Ranges	142	1	bytes
Alt-Svc	142	1	h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=86400
Cache-Control	121	1	max-age=3600
Content-Length	21	-	[ignored generic values]	20 B	86 B
Content-Security-Policy-Report-Only	142	1	script-src 'self'
Content-Type	142	2	text/html; charset=utf-8 (121) / text/html (21)
Date	142	-	[ignored generic values]	2026-03-24	2026-03-24
Etag	121	-	[ignored generic values]
Last-Modified	121	-	[ignored generic values]	2026-03-24	2026-03-24
Location	21	20	[see values below]
Referrer-Policy	142	1	strict-origin-when-cross-origin
Strict-Transport-Security	121	1	max-age=31556926
Vary	142	1	x-fh-requested-host, accept-encoding
X-Cache	142	2	MISS (115) / HIT (27)
X-Cache-Hits	142	2	0 (138) / 1 (4)
X-Content-Type-Options	142	1	nosniff
X-Frame-Options	142	1	DENY
X-Served-By	142	1	cache-bma-essb1270033-BMA
X-Timer	142	20+	[see values below]
X-XSS-Protection	142	1	1;mode=block
No rows found, please edit your search term.

HTTP header values

Found 57 row(s).

Header	Occurs	Value
Accept-Ranges	142	bytes
Alt-Svc	142	h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=86400
Cache-Control	121	max-age=3600
Content-Security-Policy-Report-Only	142	script-src 'self'
Content-Type	121	text/html; charset=utf-8
Content-Type	21	text / html
Location	2	/interop/js-interop
Location	1	/language/patterns
Location	1	https://storage.googleapis.com/dart-specification/DartLangSpecDraft.pdf
Location	1	/language/generics
Location	1	/resources/dart-3-migration
Location	1	/language/operators
Location	1	/interop/js-interop/js-types
Location	1	/libraries/dart-async
Location	1	/language
Location	1	/docs
Location	1	/language/records
Location	1	/interop/c-interop
Location	1	/web/libraries
Location	1	/effective-dart/usage
Location	1	/language/constructors
Location	1	/language/loops
Location	1	https://docs.flutter.dev/jobs
Location	1	/libraries/async/zones
Location	1	/language/pattern-types
Location	1	/interop/js-interop/package-web
Referrer-Policy	142	strict-origin-when-cross-origin
Strict-Transport-Security	121	max-age=31556926
Vary	142	x-fh-requested-host, accept-encoding
X-Cache	115	MISS
X-Cache	27	HIT
X-Cache-Hits	138	0
X-Cache-Hits	4	1
X-Content-Type-Options	142	nosniff
X-Frame-Options	142	DENY
X-Served-By	142	cache-bma-essb1270033-BMA
X-Timer	1	S1774357377.424172,VS0,VE1
X-Timer	1	S1774357378.625472,VS0,VE121
X-Timer	1	S1774357378.237764,VS0,VE111
X-Timer	1	S1774357378.825130,VS0,VE164
X-Timer	1	S1774357378.525229,VS0,VE1
X-Timer	1	S1774357378.925177,VS0,VE137
X-Timer	1	S1774357378.327805,VS0,VE119
X-Timer	1	S1774357378.057725,VS0,VE137
X-Timer	1	S1774357379.525015,VS0,VE1
X-Timer	1	S1774357378.425063,VS0,VE102
X-Timer	1	S1774357379.225825,VS0,VE1
X-Timer	1	S1774357378.124836,VS0,VE161
X-Timer	1	S1774357379.860140,VS0,VE195
X-Timer	1	S1774357379.125436,VS0,VE1
X-Timer	1	S1774357379.625136,VS0,VE153
X-Timer	1	S1774357379.725652,VS0,VE116
X-Timer	1	S1774357379.925605,VS0,VE115
X-Timer	1	S1774357379.325418,VS0,VE157
X-Timer	1	S1774357378.725365,VS0,VE114
X-Timer	1	S1774357379.025216,VS0,VE157
X-XSS-Protection	142	1;mode=block
No rows found, please edit your search term.

(+) Show entire table

HTTP Caching by content type (only from crawlable domains)

Content type	Cache type	URLs 🔽	AVG lifetime	MIN lifetime	MAX lifetime
HTML	Cache-Control + ETag + Last-Modified	121	60 min	60 min	60 min
Redirect	No cache headers	21	-	-	-

HTTP Caching by domain

Domain	Cache type	URLs 🔽	AVG lifetime	MIN lifetime	MAX lifetime
dart.dev	Cache-Control + ETag + Last-Modified	121	60 min	60 min	60 min
dart.dev	No cache headers	21	-	-	-
docs.flutter.dev	Cache-Control + ETag + Last-Modified	1	60 min	60 min	60 min

HTTP Caching by domain and content type

Domain	Content type	Cache type	URLs 🔽	AVG lifetime	MIN lifetime	MAX lifetime
dart.dev	HTML	Cache-Control + ETag + Last-Modified	121	60 min	60 min	60 min
dart.dev	Redirect	No cache headers	21	-	-	-
docs.flutter.dev	HTML	Cache-Control + ETag + Last-Modified	1	60 min	60 min	60 min

DNS info

DNS resolving tree
dart.dev
IPv4: 199.36.158.100

DNS server: 127.0.0.53

SSL/TLS info

Info	Text
Issuer	C = US, O = Google Trust Services, CN = WR3
Subject	CN = dart.dev
Valid from	Mar 6 05:33:09 2026 GMT (VALID already 18.3 day(s))
Valid to	Jun 4 06:31:18 2026 GMT (VALID still for 71.7 day(s))
Supported protocols	TLSv1.2, TLSv1.3
RAW certificate output	Certificate: Data: Version: 3 (0x2) Serial Number: 05:03:55:7b:92:96:ac:1b:12:bd:93:ad:22:7c:4c:59 Signature Algorithm: sha256WithRSAEncryption Issuer: C = US, O = Google Trust Services, CN = WR3 Validity Not Before: Mar 6 05:33:09 2026 GMT Not After : Jun 4 06:31:18 2026 GMT Subject: CN = dart.dev Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (2048 bit) Modulus: 00:aa:db:34:c9:e2:e0:0d:62:e9:5c:6f:2c:44:1d: a2:43:c2:23:df:3c:c4:2d:d9:fa:0f:a1:31:09:02: 24:50:71:82:bf:a1:ee:c2:5f:50:f0:f2:08:5e:c8: 99:c9:ab:7e:89:24:2f:42:10:59:f7:04:87:61:8b: 98:15:6b:d7:0e:dd:4a:c6:3d:40:34:e2:85:58:39: 16:5a:f8:82:f7:35:9d:85:d6:8a:3d:d9:58:ce:d0: 89:79:c3:7e:9c:0a:eb:18:f9:fa:24:7a:29:8c:f1: ab:a6:80:b2:36:ae:4e:1d:73:72:9c:51:81:b5:fb: f4:68:77:cf:9b:7e:f5:63:f7:94:ad:a5:0e:74:40: 43:32:55:f7:b6:83:9c:ca:12:0b:95:99:e3:42:1e: 86:95:d1:15:f4:db:06:77:3e:40:3d:0f:c5:cf:09: f0:8e:fa:6d:e1:a3:c9:1d:53:da:08:5f:40:1a:40: 34:97:86:0e:fa:aa:bb:ec:9f:2d:be:af:9d:fc:35: cb:b1:d0:f3:bb:fc:c7:87:26:6b:17:22:03:6b:c0: b9:c7:e7:30:87:c3:f6:a2:1b:43:73:96:2f:2e:0e: 09:86:71:b2:a4:88:d8:fe:fc:4c:e3:a6:4e:96:1a: b5:05:d1:08:90:5e:3d:2d:06:c9:59:60:f9:5e:55: 54:55 Exponent: 65537 (0x10001) X509v3 extensions: X509v3 Key Usage: critical Digital Signature, Key Encipherment X509v3 Extended Key Usage: TLS Web Server Authentication X509v3 Basic Constraints: critical CA:FALSE X509v3 Subject Key Identifier: 21:45:C2:3B:AC:4C:2C:EB:6B:4F:B5:E7:C9:E2:C3:6A:D1:BD:B3:C2 X509v3 Authority Key Identifier: C7:81:F5:FD:8E:88:D9:00:3C:4D:63:A2:50:31:24:A0:CE:23:FE:23 Authority Information Access: OCSP - URI:http://o.pki.goog/s/wr3/BQM CA Issuers - URI:http://i.pki.goog/wr3.crt X509v3 Subject Alternative Name: DNS:dart.dev X509v3 Certificate Policies: Policy: 2.23.140.1.2.1 X509v3 CRL Distribution Points: Full Name: URI:http://c.pki.goog/wr3/RqT89ooGdns.crl CT Precertificate SCTs: Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 96:97:64:BF:55:58:97:AD:F7:43:87:68:37:08:42:77: E9:F0:3A:D5:F6:A4:F3:36:6E:46:A4:3F:0F:CA:A9:C6 Timestamp : Mar 6 06:33:10.060 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C8:2A:30:9E:60:76:9B:36:22:52:1D: 3E:46:A8:97:EB:9E:C0:D2:22:B1:63:57:B2:8C:09:1F: 77:EB:E9:C8:7C:02:21:00:F3:0C:45:7F:FE:F1:B3:F2: 86:E2:D8:E6:15:B4:F5:1E:71:58:78:E5:95:4B:17:C4: A2:45:26:95:EE:DD:C9:AF Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 49:9C:9B:69:DE:1D:7C:EC:FC:36:DE:CD:87:64:A6:B8: 5B:AF:0A:87:80:19:D1:55:52:FB:E9:EB:29:DD:F8:C3 Timestamp : Mar 6 06:33:11.028 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:C4:1E:30:0F:5F:A7:69:DF:28:2B:9C: AD:C4:0B:EF:AD:11:31:B8:8B:61:F4:F0:44:6A:C7:15: A9:95:AE:2E:3D:02:20:50:61:57:FE:5E:53:BD:19:B9: 13:F6:DB:D4:21:2B:0D:E6:45:65:BD:90:08:00:ED:4A: 20:37:E7:03:96:A9:12 Signature Algorithm: sha256WithRSAEncryption Signature Value: 25:45:6f:f7:54:9c:a2:68:04:2f:bb:1b:7c:fe:fe:12:59:fd: ce:e5:02:f0:c8:5f:56:a3:2d:c4:12:70:9c:6f:de:be:bb:c9: 13:48:f0:00:38:a3:6e:c0:66:e5:ef:61:89:e9:f1:86:3c:12: f3:37:80:7f:f2:9f:a4:61:26:58:ee:cb:df:95:4e:81:a3:97: 28:15:1d:b1:43:b8:9b:d7:76:4f:cd:5b:65:3b:a8:cd:75:fe: a5:26:85:52:79:88:04:4e:b1:e1:c7:bc:39:a1:6a:ec:10:bd: 00:1a:4d:01:a8:d8:3a:fe:16:74:ed:22:cb:a2:5b:a6:ec:74: ea:16:93:f7:8b:aa:11:52:8c:40:94:ac:46:cc:6a:14:b8:10: c4:9c:8a:f8:85:94:d4:6e:94:f3:26:7f:d1:e0:1e:0b:34:e1: 31:74:25:25:01:59:a6:f8:8f:56:1f:36:37:e3:07:39:82:20: cd:9d:ec:a2:53:7d:ab:49:26:68:75:a7:6d:2f:3a:99:08:2e: 97:1c:a0:55:b1:25:6e:7e:20:2a:24:73:5d:b9:1b:ff:5d:30: 0f:8c:9a:4f:5c:87:06:0c:af:3f:40:4a:c9:93:48:8b:f4:01: e4:1f:be:cf:63:0e:29:c7:34:6e:bc:c1:a9:db:52:41:ea:dd: 0c:39:20:63
RAW protocols output	=== ssl2 === s_client: Unknown option: -ssl2 s_client: Use -help for summary. === ssl3 === s_client: Unknown option: -ssl3 s_client: Use -help for summary. === tls1 === 40A704B836740000:error:0A0000BF:SSL routines:tls_setup_handshake:no protocols available:../ssl/statem/statem_lib.c:104: CONNECTED(00000003) --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 7 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) --- === tls1_1 === 40E736534C740000:error:0A0000BF:SSL routines:tls_setup_handshake:no protocols available:../ssl/statem/statem_lib.c:104: CONNECTED(00000003) --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 7 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) --- === tls1_2 === depth=2 C = US, O = Google Trust Services LLC, CN = GTS Root R1 verify return:1 depth=1 C = US, O = Google Trust Services, CN = WR3 verify return:1 depth=0 CN = dart.dev verify return:1 CONNECTED(00000003) --- Certificate chain 0 s:CN = dart.dev i:C = US, O = Google Trust Services, CN = WR3 a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256 v:NotBefore: Mar 6 05:33:09 2026 GMT; NotAfter: Jun 4 06:31:18 2026 GMT 1 s:C = US, O = Google Trust Services, CN = WR3 i:C = US, O = Google Trust Services LLC, CN = GTS Root R1 a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256 v:NotBefore: Dec 13 09:00:00 2023 GMT; NotAfter: Feb 20 14:00:00 2029 GMT 2 s:C = US, O = Google Trust Services LLC, CN = GTS Root R1 i:C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256 v:NotBefore: Jun 19 00:00:42 2020 GMT; NotAfter: Jan 28 00:00:42 2028 GMT --- Server certificate -----BEGIN CERTIFICATE----- MIIFHDCCBASgAwIBAgIQBQNVe5KWrBsSvZOtInxMWTANBgkqhkiG9w0BAQsFADA7 MQswCQYDVQQGEwJVUzEeMBwGA1UEChMVR29vZ2xlIFRydXN0IFNlcnZpY2VzMQww CgYDVQQDEwNXUjMwHhcNMjYwMzA2MDUzMzA5WhcNMjYwNjA0MDYzMTE4WjATMREw DwYDVQQDEwhkYXJ0LmRldjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AKrbNMni4A1i6VxvLEQdokPCI988xC3Z+g+hMQkCJFBxgr+h7sJfUPDyCF7Imcmr fokkL0IQWfcEh2GLmBVr1w7dSsY9QDTihVg5Flr4gvc1nYXWij3ZWM7QiXnDfpwK 6xj5+iR6KYzxq6aAsjauTh1zcpxRgbX79Gh3z5t+9WP3lK2lDnRAQzJV97aDnMoS C5WZ40IehpXRFfTbBnc+QD0Pxc8J8I76beGjyR1T2ghfQBpANJeGDvqqu+yfLb6v nfw1y7HQ87v8x4cmaxciA2vAucfnMIfD9qIbQ3OWLy4OCYZxsqSI2P78TOOmTpYa tQXRCJBePS0GyVlg+V5VVFUCAwEAAaOCAkIwggI+MA4GA1UdDwEB/wQEAwIFoDAT BgNVHSUEDDAKBggrBgEFBQcDATAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQhRcI7 rEws62tPtefJ4sNq0b2zwjAfBgNVHSMEGDAWgBTHgfX9jojZADxNY6JQMSSgziP+ IzBeBggrBgEFBQcBAQRSMFAwJwYIKwYBBQUHMAGGG2h0dHA6Ly9vLnBraS5nb29n L3Mvd3IzL0JRTTAlBggrBgEFBQcwAoYZaHR0cDovL2kucGtpLmdvb2cvd3IzLmNy dDATBgNVHREEDDAKgghkYXJ0LmRldjATBgNVHSAEDDAKMAgGBmeBDAECATA2BgNV HR8ELzAtMCugKaAnhiVodHRwOi8vYy5wa2kuZ29vZy93cjMvUnFUODlvb0dkbnMu Y3JsMIIBBQYKKwYBBAHWeQIEAgSB9gSB8wDxAHcAlpdkv1VYl633Q4doNwhCd+nw OtX2pPM2bkakPw/KqcYAAAGcwdmcrAAABAMASDBGAiEAyCownmB2mzYiUh0+RqiX 657A0iKxY1eyjAkfd+vpyHwCIQDzDEV//vGz8obi2OYVtPUecVh45ZVLF8SiRSaV 7t3JrwB2AEmcm2neHXzs/DbezYdkprhbrwqHgBnRVVL76esp3fjDAAABnMHZoHQA AAQDAEcwRQIhAMQeMA9fp2nfKCucrcQL760RMbiLYfTwRGrHFamVri49AiBQYVf+ XlO9GbkT9tvUISsN5kVlvZAIAO1KIDfnA5apEjANBgkqhkiG9w0BAQsFAAOCAQEA JUVv91ScomgEL7sbfP7+Eln9zuUC8MhfVqMtxBJwnG/evrvJE0jwADijbsBm5e9h ienxhjwS8zeAf/KfpGEmWO7L35VOgaOXKBUdsUO4m9d2T81bZTuozXX+pSaFUnmI BE6x4ce8OaFq7BC9ABpNAajYOv4WdO0iy6Jbpux06haT94uqEVKMQJSsRsxqFLgQ xJyK+IWU1G6U8yZ/0eAeCzThMXQlJQFZpviPVh82N+MHOYIgzZ3solN9q0kmaHWn bS86mQgulxygVbElbn4gKiRzXbkb/10wD4yaT1yHBgyvP0BKyZNIi/QB5B++z2MO Kcc0brzBqdtSQerdDDkgYw== -----END CERTIFICATE----- subject=CN = dart.dev issuer=C = US, O = Google Trust Services, CN = WR3 --- No client certificate CA names sent Peer signing digest: SHA256 Peer signature type: RSA-PSS Server Temp Key: X25519, 253 bits --- SSL handshake has read 4646 bytes and written 290 bytes Verification: OK --- New, TLSv1.2, Cipher is ECDHE-RSA-CHACHA20-POLY1305 Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session: Protocol : TLSv1.2 Cipher : ECDHE-RSA-CHACHA20-POLY1305 Session-ID: 903ACF2C1D6D1D99E9302EFDE4FCE06EEB5A6493E24920812D413F51807D5F62 Session-ID-ctx: Master-Key: 9A249FBAE8A212EF8866D5A62644A82A1B50237AB10DD403A187582A9A5D86D574D956586D51CF7C928E0EC856F6D103 PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 86400 (seconds) TLS session ticket: 0000 - 79 8f 2a 4d c1 17 c6 8a-fe 2b b0 05 4d 27 4d 2e y.M.....+..M'M. 0010 - a2 d9 80 35 67 29 8c bf-59 00 8b 69 06 58 44 b6 ...5g)..Y..i.XD. 0020 - 79 d3 ef 2c da 6b 60 39-c8 c1 bf ba 36 9d 97 99 y..,.k`9....6... 0030 - d8 09 c1 1a b1 88 94 14-c6 aa 63 53 b5 cf 7e 5e ..........cS..~^ 0040 - 71 7f 45 d1 68 f2 7e 65-2a 67 fb 70 b4 63 f0 e8 q.E.h.~eg.p.c.. 0050 - 6c 9d 1f d8 f4 4c 08 cb-2f cc 1b 4b c2 49 5c 70 l....L../..K.I\p 0060 - a2 0a 5e 9e 63 70 48 83-be f0 ac 65 b6 2d 16 54 ..^.cpH....e.-.T 0070 - 82 e2 7c ed 30 7c 65 51-0a ce d7 a4 b2 4b f4 2c ..\|.0\|eQ.....K., 0080 - 35 5d 52 b1 26 7e 31 c8-29 16 8c 70 cd 25 e8 46 5]R.&~1.)..p.%.F 0090 - 8a 92 3d c4 94 1f f7 cd-b3 42 fb e7 48 2d 00 d0 ..=......B..H-.. 00a0 - f4 2a 33 cd c1 b0 6d c2-d1 e4 3e d8 ba be 46 28 .3...m...>...F( 00b0 - 0e ae d5 4e c4 5c bf e8-c6 ae c4 e5 d0 08 e1 25 ...N.\.........% Start Time: 1774357392 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: yes --- DONE === tls1_3 === depth=2 C = US, O = Google Trust Services LLC, CN = GTS Root R1 verify return:1 depth=1 C = US, O = Google Trust Services, CN = WR3 verify return:1 depth=0 CN = dart.dev verify return:1 CONNECTED(00000003) --- Certificate chain 0 s:CN = dart.dev i:C = US, O = Google Trust Services, CN = WR3 a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256 v:NotBefore: Mar 6 05:33:09 2026 GMT; NotAfter: Jun 4 06:31:18 2026 GMT 1 s:C = US, O = Google Trust Services, CN = WR3 i:C = US, O = Google Trust Services LLC, CN = GTS Root R1 a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256 v:NotBefore: Dec 13 09:00:00 2023 GMT; NotAfter: Feb 20 14:00:00 2029 GMT 2 s:C = US, O = Google Trust Services LLC, CN = GTS Root R1 i:C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256 v:NotBefore: Jun 19 00:00:42 2020 GMT; NotAfter: Jan 28 00:00:42 2028 GMT --- Server certificate -----BEGIN CERTIFICATE----- MIIFHDCCBASgAwIBAgIQBQNVe5KWrBsSvZOtInxMWTANBgkqhkiG9w0BAQsFADA7 MQswCQYDVQQGEwJVUzEeMBwGA1UEChMVR29vZ2xlIFRydXN0IFNlcnZpY2VzMQww CgYDVQQDEwNXUjMwHhcNMjYwMzA2MDUzMzA5WhcNMjYwNjA0MDYzMTE4WjATMREw DwYDVQQDEwhkYXJ0LmRldjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AKrbNMni4A1i6VxvLEQdokPCI988xC3Z+g+hMQkCJFBxgr+h7sJfUPDyCF7Imcmr fokkL0IQWfcEh2GLmBVr1w7dSsY9QDTihVg5Flr4gvc1nYXWij3ZWM7QiXnDfpwK 6xj5+iR6KYzxq6aAsjauTh1zcpxRgbX79Gh3z5t+9WP3lK2lDnRAQzJV97aDnMoS C5WZ40IehpXRFfTbBnc+QD0Pxc8J8I76beGjyR1T2ghfQBpANJeGDvqqu+yfLb6v nfw1y7HQ87v8x4cmaxciA2vAucfnMIfD9qIbQ3OWLy4OCYZxsqSI2P78TOOmTpYa tQXRCJBePS0GyVlg+V5VVFUCAwEAAaOCAkIwggI+MA4GA1UdDwEB/wQEAwIFoDAT BgNVHSUEDDAKBggrBgEFBQcDATAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQhRcI7 rEws62tPtefJ4sNq0b2zwjAfBgNVHSMEGDAWgBTHgfX9jojZADxNY6JQMSSgziP+ IzBeBggrBgEFBQcBAQRSMFAwJwYIKwYBBQUHMAGGG2h0dHA6Ly9vLnBraS5nb29n L3Mvd3IzL0JRTTAlBggrBgEFBQcwAoYZaHR0cDovL2kucGtpLmdvb2cvd3IzLmNy dDATBgNVHREEDDAKgghkYXJ0LmRldjATBgNVHSAEDDAKMAgGBmeBDAECATA2BgNV HR8ELzAtMCugKaAnhiVodHRwOi8vYy5wa2kuZ29vZy93cjMvUnFUODlvb0dkbnMu Y3JsMIIBBQYKKwYBBAHWeQIEAgSB9gSB8wDxAHcAlpdkv1VYl633Q4doNwhCd+nw OtX2pPM2bkakPw/KqcYAAAGcwdmcrAAABAMASDBGAiEAyCownmB2mzYiUh0+RqiX 657A0iKxY1eyjAkfd+vpyHwCIQDzDEV//vGz8obi2OYVtPUecVh45ZVLF8SiRSaV 7t3JrwB2AEmcm2neHXzs/DbezYdkprhbrwqHgBnRVVL76esp3fjDAAABnMHZoHQA AAQDAEcwRQIhAMQeMA9fp2nfKCucrcQL760RMbiLYfTwRGrHFamVri49AiBQYVf+ XlO9GbkT9tvUISsN5kVlvZAIAO1KIDfnA5apEjANBgkqhkiG9w0BAQsFAAOCAQEA JUVv91ScomgEL7sbfP7+Eln9zuUC8MhfVqMtxBJwnG/evrvJE0jwADijbsBm5e9h ienxhjwS8zeAf/KfpGEmWO7L35VOgaOXKBUdsUO4m9d2T81bZTuozXX+pSaFUnmI BE6x4ce8OaFq7BC9ABpNAajYOv4WdO0iy6Jbpux06haT94uqEVKMQJSsRsxqFLgQ xJyK+IWU1G6U8yZ/0eAeCzThMXQlJQFZpviPVh82N+MHOYIgzZ3solN9q0kmaHWn bS86mQgulxygVbElbn4gKiRzXbkb/10wD4yaT1yHBgyvP0BKyZNIi/QB5B++z2MO Kcc0brzBqdtSQerdDDkgYw== -----END CERTIFICATE----- subject=CN = dart.dev issuer=C = US, O = Google Trust Services, CN = WR3 --- No client certificate CA names sent Peer signing digest: SHA256 Peer signature type: RSA-PSS Server Temp Key: X25519, 253 bits --- SSL handshake has read 4543 bytes and written 306 bytes Verification: OK --- New, TLSv1.3, Cipher is TLS_AES_128_GCM_SHA256 Server public key is 2048 bit Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) --- DONE --- Post-Handshake New Session Ticket arrived: SSL-Session: Protocol : TLSv1.3 Cipher : TLS_AES_128_GCM_SHA256 Session-ID: 21DF81A9EA348666F1E330719F9FCED220B1A0982F75B955048B39F1AC31D9E8 Session-ID-ctx: Resumption PSK: 5F8443D1988ECDF5B2FDED3CE9BB9B534BD80CDC449DFAB822EB93BEFF56CC2E PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 86400 (seconds) TLS session ticket: 0000 - 79 8f 2a 4d c1 17 c6 8a-fe 2b b0 05 4d 27 4d 2e y.M.....+..M'M. 0010 - 9b 6c 98 09 49 e4 71 36-f2 93 84 cf ec db 35 66 .l..I.q6......5f 0020 - 91 3b 17 5d ad 56 86 63-c1 95 01 c4 22 25 99 b6 .;.].V.c...."%.. 0030 - 9c 07 11 6e cc 11 cc 84-88 40 0f cf 8d 0e a6 e7 ...n.....@...... 0040 - 37 a7 32 31 c8 08 28 9b-e5 a0 8d c1 3f 84 33 f2 7.21..(.....?.3. 0050 - d8 50 4e a4 79 42 0a c8-90 c2 2e cd 85 34 95 9e .PN.yB.......4.. 0060 - 79 60 74 f5 f2 64 3d ea-ab 2e 54 05 0e 98 33 47 y`t..d=...T...3G 0070 - dc e0 ab 07 48 7a 58 58-39 7f 0f 19 b3 17 a3 7f ....HzXX9....... 0080 - 9a 41 07 4b 76 e8 06 30-b1 32 5a ed 03 eb d5 41 .A.Kv..0.2Z....A 0090 - 6b 2b 9d d4 69 4c 14 fa-bd c1 1e af 2c 51 b1 dc k+..iL......,Q.. Start Time: 1774357392 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no Max Early Data: 0 --- read R BLOCK

Crawler stats

Basic stats
Total execution time	17 s
Total URLs	143
Total size	19 MB
Requests - total time	16 s
Requests - avg time	117 ms
Requests - min time	8 ms
Requests - max time	235 ms
Requests by status	200: 122 301: 21

Analysis stats

Found 21 row(s).

Class::method	Exec time 🔽	Exec count
AccessibilityAnalyzer::checkMissingAriaLabels	690 ms	121
AccessibilityAnalyzer::checkMissingLabels	639 ms	121
AccessibilityAnalyzer::checkMissingRoles	549 ms	121
SslTlsAnalyzer::getTLSandSSLCertificateInfo	527 ms	1
BestPracticeAnalyzer::checkHeadingStructure	519 ms	122
AccessibilityAnalyzer::checkMissingLang	467 ms	121
BestPracticeAnalyzer::checkMaxDOMDepth	435 ms	122
BestPracticeAnalyzer::checkNonClickablePhoneNumbers	181 ms	122
BestPracticeAnalyzer::checkInlineSvg	109 ms	122
BestPracticeAnalyzer::checkMissingQuotesOnAttributes	51 ms	122
SecurityAnalyzer::checkHtmlSecurity	19 ms	121
AccessibilityAnalyzer::checkImageAltAttributes	18 ms	121
SeoAndOpenGraphAnalyzer::analyzeHeadings	16 ms	1
SecurityAnalyzer::checkHeaders	3 ms	121
SeoAndOpenGraphAnalyzer::analyzeSeo	0 ms	1
SeoAndOpenGraphAnalyzer::analyzeOpenGraph	0 ms	1
BestPracticeAnalyzer::checkTitleUniqueness	0 ms	1
BestPracticeAnalyzer::checkMetaDescriptionUniqueness	0 ms	1
BestPracticeAnalyzer::checkBrotliSupport	0 ms	1
BestPracticeAnalyzer::checkWebpSupport	0 ms	1
BestPracticeAnalyzer::checkAvifSupport	0 ms	1
No rows found, please edit your search term.

(+) Show entire table

Content processor stats

Found 12 row(s).

Class::method	Exec time 🔽	Exec count
HtmlProcessor::findUrls	160 ms	142
NextJsProcessor::applyContentChangesBeforeUrlParsing	74 ms	122
JavaScriptProcessor::findUrls	70 ms	121
CssProcessor::findUrls	4 ms	121
AstroProcessor::findUrls	2 ms	121
AstroProcessor::applyContentChangesBeforeUrlParsing	0 ms	122
NextJsProcessor::findUrls	0 ms	121
JavaScriptProcessor::applyContentChangesBeforeUrlParsing	0 ms	122
HtmlProcessor::applyContentChangesBeforeUrlParsing	0 ms	143
SvelteProcessor::applyContentChangesBeforeUrlParsing	0 ms	122
SvelteProcessor::findUrls	0 ms	121
CssProcessor::applyContentChangesBeforeUrlParsing	0 ms	122
No rows found, please edit your search term.

Crawler info

Version	2.1.0.20260317
Executed At	2026-03-24 13:02:55
Command	siteone-crawler --url=https://dart.dev/guides --markdown-export-dir=/tmp/siteone-dart --markdown-exclude-selector=header,footer,nav,.sidebar,.menu,.breadcrumb,script,style --timeout=30 --workers=5 --disable-javascript --disable-styles --disable-fonts --disable-images --disable-files --no-color --hide-progress-bar --output=text --ignore-regex=/community/\|/tools/dartpad
Hostname	ubuntu-8gb-hel1-1
User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/26.0.0.0 Safari/537.36 siteone-crawler/2.1.0.20260317