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clipboard</div></span></h1><div class="metadata">Published <span><a class="-x-ago" href="" title="Nov 21, 2024" role="button" data-timestamp="1732212857546">5 months ago</a></span> • <a class="-pub-publisher" href="/publishers/fluttercommunity.dev"><img class="-pub-publisher-shield filter-invert-on-dark" src="/static/hash-6oi64i7a/img/material-icon-verified.svg" alt="verified publisher" width="14" height="14" title="Published by a pub.dev verified publisher"/>fluttercommunity.dev</a><span class="package-badge" title="Package is compatible with Dart 3.">Dart 3 compatible</span>• Latest: <span><a href="/packages/equatable" title="View the latest version of equatable">2.0.7</a></span> / <span>Prerelease: <a href="/packages/equatable/versions/3.0.0-dev.1" title="Visit equatable 3.0.0-dev.1 page">3.0.0-dev.1</a></span></div><div class="detail-tags-and-like"><div class="detail-tags"><div class="-pub-tag-badge"><span class="tag-badge-main">SDK</span><a class="tag-badge-sub" 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explicitly override == and hashCode.</p><p class="detail-lead-more"><a class="detail-metadata-toggle">More...</a></p></div></div><div class="detail-body"><div class="detail-tabs"><div class="detail-tabs-wide-header"><div class="detail-container"><ul class="detail-tabs-header"><li class="detail-tab tab-button detail-tab-readme-title -active">Readme</li><li class="detail-tab tab-link detail-tab-changelog-title"><a href="/packages/equatable/changelog" role="button">Changelog</a></li><li class="detail-tab tab-link detail-tab-example-title"><a href="/packages/equatable/example" role="button">Example</a></li><li class="detail-tab tab-link detail-tab-installing-title"><a href="/packages/equatable/install" role="button">Installing</a></li><li class="detail-tab tab-link detail-tab-versions-title"><a href="/packages/equatable/versions" role="button">Versions</a></li><li class="detail-tab tab-link detail-tab-analysis-title"><a href="/packages/equatable/score" role="button">Scores</a></li></ul></div></div><div class="detail-container detail-body-main"><div class="detail-tabs-content"><section class="tab-content detail-tab-readme-content -active markdown-body"><img src="https://github.com/felangel/equatable/raw/master/doc/assets/equatable_logo_full.png" width="100%" alt="logo"> <h2 align="center"> Simplify Equality Comparisons </h2> <p align="center"> <a href="https://github.com/felangel/equatable/actions" rel="ugc"> <img alt="Build Status" src="https://github.com/felangel/equatable/workflows/build/badge.svg"> </a> <a href="https://github.com/felangel/equatable/actions" rel="ugc"> <img alt="Code Coverage" src="https://raw.githubusercontent.com/felangel/equatable/master/coverage_badge.svg"> </a> <a href="https://pub.dartlang.org/packages/equatable" rel="ugc"> <img alt="Pub Package" src="https://img.shields.io/pub/v/equatable.svg"> </a> <br> <a href="https://github.com/felangel/equatable" rel="ugc"> <img src="https://img.shields.io/github/stars/felangel/equatable.svg?style=flat&logo=github&colorB=deeppink&label=stars" alt="Star on GitHub"> </a> <a href="https://discord.gg/Hc5KD3g" rel="ugc"> <img src="https://img.shields.io/discord/649708778631200778.svg?logo=discord&color=blue" alt="Discord"> </a> <a href="https://opensource.org/licenses/MIT" rel="ugc"> <img alt="MIT License" src="https://img.shields.io/badge/License-MIT-blue.svg"> </a> </p> <hr> <h2 id="overview" class="hash-header">Overview <a href="#overview" class="hash-link">#</a></h2> <p>Being able to compare objects in <code>Dart</code> often involves having to override the <code>==</code> operator as well as <code>hashCode</code>.</p> <p>Not only is it verbose and tedious, but failure to do so can lead to inefficient code which does not behave as we expect.</p> <p>By default, <code>==</code> returns true if two objects are the same instance.</p> <p>Let's say we have the following class:</p> <pre><code class="language-dart">class Person { const Person(this.name); final String name; } </code></pre> <p>We can create instances of <code>Person</code> like so:</p> <pre><code class="language-dart">void main() { final Person bob = Person("Bob"); } </code></pre> <p>Later if we try to compare two instances of <code>Person</code> either in our production code or in our tests we will run into a problem.</p> <pre><code class="language-dart">print(bob == Person("Bob")); // false </code></pre> <p>For more information about this, you can check out the official <a href="https://www.dartlang.org/guides/language/effective-dart/design#equality" rel="ugc">Dart Documentation</a>.</p> <p>In order to be able to compare two instances of <code>Person</code> we need to change our class to override <code>==</code> and <code>hashCode</code> like so:</p> <pre><code class="language-dart">class Person { const Person(this.name); final String name; @override bool operator ==(Object other) => identical(this, other) || other is Person && runtimeType == other.runtimeType && name == other.name; @override int get hashCode => name.hashCode; } </code></pre> <p>Now if we run the following code again:</p> <pre><code class="language-dart">print(bob == Person("Bob")); // true </code></pre> <p>it will be able to compare different instances of <code>Person</code>.</p> <p>You can see how this can quickly become a hassle when dealing with complex classes. This is where <code>Equatable</code> comes in!</p> <h2 id="what-does-equatable-do" class="hash-header">What does Equatable do? <a href="#what-does-equatable-do" class="hash-link">#</a></h2> <p><code>Equatable</code> overrides <code>==</code> and <code>hashCode</code> for you so you don't have to waste your time writing lots of boilerplate code.</p> <p>There are other packages that will actually generate the boilerplate for you; however, you still have to run the code generation step which is not ideal.</p> <p>With <code>Equatable</code> there is no code generation needed and we can focus more on writing amazing applications and less on mundane tasks.</p> <h2 id="usage" class="hash-header">Usage <a href="#usage" class="hash-link">#</a></h2> <p>First, we need to do add <code>equatable</code> to the dependencies of the <code>pubspec.yaml</code></p> <pre><code class="language-yaml">dependencies: equatable: ^2.0.0 </code></pre> <p>Next, we need to install it:</p> <pre><code class="language-sh"># Dart pub get # Flutter flutter packages get </code></pre> <p>Lastly, we need to extend <code>Equatable</code></p> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name); final String name; @override List<Object> get props => [name]; } </code></pre> <p>When working with json:</p> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name); final String name; @override List<Object> get props => [name]; factory Person.fromJson(Map<String, dynamic> json) { return Person(json['name']); } } </code></pre> <p>We can now compare instances of <code>Person</code> just like before without the pain of having to write all of that boilerplate. <strong>Note:</strong> Equatable is designed to only work with immutable objects so all member variables must be final (This is not just a feature of <code>Equatable</code> - <a href="https://dart.dev/guides/language/effective-dart/design#avoid-defining-custom-equality-for-mutable-classes">overriding a <code>hashCode</code> with a mutable value can break hash-based collections</a>).</p> <p>Equatable also supports <code>const</code> constructors:</p> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name); final String name; @override List<Object> get props => [name]; } </code></pre> <p>Equatable also supports nullable props:</p> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name, [this.age]); final String name; final int? age; @override List<Object?> get props => [name, age]; } </code></pre> <h3 id="tostring-implementation" class="hash-header"><code>toString</code> Implementation <a href="#tostring-implementation" class="hash-link">#</a></h3> <p>Equatable can implement <code>toString</code> method including all the given props. If you want that behaviour for a specific <code>Equatable</code> object, just include the following:</p> <pre><code class="language-dart">@override bool get stringify => true; </code></pre> <p>For instance:</p> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name); final String name; @override List<Object> get props => [name]; @override bool get stringify => true; } </code></pre> <p>For the name <code>Bob</code>, the output will be:</p> <p><code>Person(Bob)</code></p> <p>This flag by default is false and <code>toString</code> will return just the type:</p> <p><code>Person</code></p> <h4 id="equatableconfig">EquatableConfig</h4> <p><code>stringify</code> can also be configured globally for all <code>Equatable</code> instances via <code>EquatableConfig</code></p> <pre><code class="language-dart">EquatableConfig.stringify = true; </code></pre> <p>If <code>stringify</code> is overridden for a specific <code>Equatable</code> class, then the value of <code>EquatableConfig.stringify</code> is ignored. In other words, the local configuration always takes precedence over the global configuration.</p> <p><em>Note: <code>EquatableConfig.stringify</code> defaults to <code>true</code> in debug mode and <code>false</code> in release mode.</em></p> <h2 id="recap" class="hash-header">Recap <a href="#recap" class="hash-link">#</a></h2> <h3 id="without-equatable" class="hash-header">Without Equatable <a href="#without-equatable" class="hash-link">#</a></h3> <pre><code class="language-dart">class Person { const Person(this.name); final String name; @override bool operator ==(Object other) => identical(this, other) || other is Person && runtimeType == other.runtimeType && name == other.name; @override int get hashCode => name.hashCode; } </code></pre> <h3 id="with-equatable" class="hash-header">With Equatable <a href="#with-equatable" class="hash-link">#</a></h3> <pre><code class="language-dart">import 'package:equatable/equatable.dart'; class Person extends Equatable { const Person(this.name); final String name; @override List<Object> get props => [name]; } </code></pre> <h2 id="equatablemixin" class="hash-header">EquatableMixin <a href="#equatablemixin" class="hash-link">#</a></h2> <p>Sometimes it isn't possible to extend <code>Equatable</code> because your class already has a superclass. In this case, you can still get the benefits of <code>Equatable</code> by using the <code>EquatableMixin</code>.</p> <h3 id="usage-2" class="hash-header">Usage <a href="#usage-2" class="hash-link">#</a></h3> <p>Let's say we want to make an <code>EquatableDateTime</code> class, we can use <code>EquatableMixin</code> like so:</p> <pre><code class="language-dart">class EquatableDateTime extends DateTime with EquatableMixin { EquatableDateTime( int year, [ int month = 1, int day = 1, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0, ]) : super(year, month, day, hour, minute, second, millisecond, microsecond); @override List<Object> get props { return [year, month, day, hour, minute, second, millisecond, microsecond]; } } </code></pre> <p>Now if we want to create a subclass of <code>EquatableDateTime</code>, we can just override <code>props</code>.</p> <pre><code class="language-dart">class EquatableDateTimeSubclass extends EquatableDateTime { final int century; EquatableDateTimeSubclass( this.century, int year,[ int month = 1, int day = 1, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0, ]) : super(year, month, day, hour, minute, second, millisecond, microsecond); @override List<Object> get props => [...super.props, century]; } </code></pre> <h2 id="benchmarks" class="hash-header">Benchmarks <a href="#benchmarks" class="hash-link">#</a></h2> <p>You can see and run performance benchmarks by heading over to <a href="https://github.com/felangel/equatable/blob/master/benchmarks" rel="ugc">benchmarks</a>.</p> <h2 id="maintainers" class="hash-header">Maintainers <a href="#maintainers" class="hash-link">#</a></h2> <ul> <li><a href="https://github.com/felangel" rel="ugc">Felix Angelov</a></li> </ul> </section></div></div></div><aside class="detail-info-box"><a class="packages-scores" href="/packages/equatable/score"><div class="packages-score packages-score-like"><div class="packages-score-value 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data-ga-click-event="screenshot-thumbnail-click"><img class="thumbnail-image" src="/packages/equatable/versions/2.0.7/gen-res/gen/190x190/equatable_logo.webp" alt="screenshot" title="View screenshots" tabindex="0"/></div><img class="collections-icon" src="/static/hash-6oi64i7a/img/collections_white_24dp.svg" alt="" width="30" height="30" role="presentation"/></div><h3 class="title">Publisher</h3><p><a href="/publishers/fluttercommunity.dev"><img class="-pub-publisher-shield filter-invert-on-dark" src="/static/hash-6oi64i7a/img/material-icon-verified.svg" alt="verified publisher" width="14" height="14" title="Published by a pub.dev verified publisher"/>fluttercommunity.dev</a></p><h3 class="title">Weekly Downloads</h3><div id="-weekly-downloads-sparkline" class="weekly-downloads-sparkline" data-widget="weekly-sparkline" data-weekly-sparkline-points="gHMNaFfRDQBXNA0AkPwNAIXyEACbyQ4A+cENAFqWDgDBwg4AqasQAHQRDgBwRA0AhfkNAOndDwDPRw0ADKEMAPMQDADu+QUAUrkHANxtDQDTGRAArqwNAJ19DQBBOw0AxjgLAAtLCwDe3gwA7jkOACPECwB3igsAw9cKAGYUDAB5NwoAbN8LAGDlCgBVQAsAJ/sLALgRCQCJhgoAaJUKAHAhCgCEpQkAFLsKAD40CgAVEw0Ad7kKAOCDCgDaQwoAUCUKAL31CgDf9QoAYnAJAGovCQA="></div><h3 class="title pkg-infobox-metadata">Metadata</h3><p>A Dart package that helps to implement value based equality without needing to explicitly override == and hashCode.</p><p><a class="link" href="https://github.com/felangel/equatable" rel="ugc">Repository (GitHub)</a><br/><a class="link" href="https://github.com/felangel/equatable/issues" rel="ugc">View/report issues</a><br/><a class="link" href="https://github.com/felangel/equatable/blob/master/CONTRIBUTING.md" rel="ugc">Contributing</a><br/></p><h3 class="title">Topics</h3><p><a class="topics-tag" href="/packages?q=topic%3Aequality" rel="nofollow">#equality</a> <a class="topics-tag" href="/packages?q=topic%3Aequals" rel="nofollow">#equals</a></p><h3 class="title">Documentation</h3><p><a class="link" href="https://github.com/felangel/equatable" rel="ugc">Documentation</a><br/><a class="link" href="/documentation/equatable/latest/">API reference</a><br/></p><h3 class="title">Funding</h3><p>Consider supporting this project:<br/><br/><a class="link" href="https://github.com/sponsors/felangel" rel="ugc">github.com</a><br/></p><h3 class="title">License</h3><p><img class="inline-icon-img filter-invert-on-dark" src="/static/hash-6oi64i7a/img/material-icon-balance.svg" alt="" width="14" height="14" role="presentation"/>MIT (<a href="/packages/equatable/license">license</a>)</p><h3 class="title">Dependencies</h3><p><a href="/packages/collection" title="^1.15.0">collection</a>, <a href="/packages/meta" title="^1.3.0">meta</a></p><h3 class="title">More</h3><p><a href="/packages?q=dependency%3Aequatable" rel="nofollow">Packages that depend on equatable</a></p></aside></div><script type="application/ld+json">{"@context":"http\u003a\u002f\u002fschema.org","@type":"SoftwareSourceCode","name":"equatable","version":"2.0.7","description":"equatable - A Dart package that helps to implement value based equality without needing to explicitly override \u003d\u003d and hashCode.","url":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002fequatable","dateCreated":"2019-01-06T19\u003a33\u003a39.683748Z","dateModified":"2024-11-21T18\u003a14\u003a17.546841Z","programmingLanguage":"Dart","image":"https\u003a\u002f\u002fpub.dev\u002fstatic\u002fimg\u002fpub-dev-icon-cover-image.png","license":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002fequatable\u002flicense"}</script></div><div class="detail-metadata"><h3 class="detail-metadata-title"><span class="detail-metadata-toggle">←</span> Metadata</h3><div class="detail-info-box"><a class="packages-scores" href="/packages/equatable/score"><div class="packages-score packages-score-like"><div class="packages-score-value -has-value"><span class="packages-score-value-number">3.41k</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">likes</div></div><div class="packages-score packages-score-health"><div class="packages-score-value -has-value"><span class="packages-score-value-number">160</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">points</div></div><div class="packages-score packages-score-downloads" title="Number of downloads of this package during the past 30 days"><div class="packages-score-value -has-value"><span class="packages-score-value-number">3.88M</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">downloads</div></div></a><div class="detail-screenshot-thumbnail"><div class="thumbnail-container" data-thumbnail="/packages/equatable/versions/2.0.7/gen-res/gen/equatable_logo.webp" data-thumbnail-descriptions-json="["The equatable package logo."]" data-ga-click-event="screenshot-thumbnail-click"><img class="thumbnail-image" src="/packages/equatable/versions/2.0.7/gen-res/gen/190x190/equatable_logo.webp" alt="screenshot" title="View screenshots" tabindex="0"/></div><img class="collections-icon" src="/static/hash-6oi64i7a/img/collections_white_24dp.svg" alt="" width="30" height="30" role="presentation"/></div><h3 class="title">Publisher</h3><p><a href="/publishers/fluttercommunity.dev"><img class="-pub-publisher-shield filter-invert-on-dark" src="/static/hash-6oi64i7a/img/material-icon-verified.svg" alt="verified publisher" width="14" height="14" title="Published by a pub.dev verified publisher"/>fluttercommunity.dev</a></p><h3 class="title">Weekly Downloads</h3><div id="-weekly-downloads-sparkline" class="weekly-downloads-sparkline" data-widget="weekly-sparkline" data-weekly-sparkline-points="gHMNaFfRDQBXNA0AkPwNAIXyEACbyQ4A+cENAFqWDgDBwg4AqasQAHQRDgBwRA0AhfkNAOndDwDPRw0ADKEMAPMQDADu+QUAUrkHANxtDQDTGRAArqwNAJ19DQBBOw0AxjgLAAtLCwDe3gwA7jkOACPECwB3igsAw9cKAGYUDAB5NwoAbN8LAGDlCgBVQAsAJ/sLALgRCQCJhgoAaJUKAHAhCgCEpQkAFLsKAD40CgAVEw0Ad7kKAOCDCgDaQwoAUCUKAL31CgDf9QoAYnAJAGovCQA="></div><h3 class="title pkg-infobox-metadata">Metadata</h3><p>A Dart package that helps to implement value based equality without needing to explicitly override == and hashCode.</p><p><a class="link" href="https://github.com/felangel/equatable" rel="ugc">Repository (GitHub)</a><br/><a class="link" href="https://github.com/felangel/equatable/issues" rel="ugc">View/report issues</a><br/><a class="link" href="https://github.com/felangel/equatable/blob/master/CONTRIBUTING.md" rel="ugc">Contributing</a><br/></p><h3 class="title">Topics</h3><p><a class="topics-tag" href="/packages?q=topic%3Aequality" rel="nofollow">#equality</a> <a class="topics-tag" href="/packages?q=topic%3Aequals" rel="nofollow">#equals</a></p><h3 class="title">Documentation</h3><p><a class="link" href="https://github.com/felangel/equatable" rel="ugc">Documentation</a><br/><a class="link" href="/documentation/equatable/latest/">API reference</a><br/></p><h3 class="title">Funding</h3><p>Consider supporting this project:<br/><br/><a class="link" href="https://github.com/sponsors/felangel" rel="ugc">github.com</a><br/></p><h3 class="title">License</h3><p><img class="inline-icon-img filter-invert-on-dark" src="/static/hash-6oi64i7a/img/material-icon-balance.svg" alt="" width="14" height="14" role="presentation"/>MIT (<a href="/packages/equatable/license">license</a>)</p><h3 class="title">Dependencies</h3><p><a href="/packages/collection" title="^1.15.0">collection</a>, <a href="/packages/meta" title="^1.3.0">meta</a></p><h3 class="title">More</h3><p><a href="/packages?q=dependency%3Aequatable" rel="nofollow">Packages that depend on equatable</a></p></div><p 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