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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1, user-scalable=no"> <meta name="description" content="API docs for the LinkedHashSet class from the dart:collection library, for the Dart programming language."> <title>LinkedHashSet class - dart:collection library - Dart API</title> <link rel="canonical" href="https://api.dart.dev/dart-collection/LinkedHashSet-class.html"> <link rel="preconnect" href="https://fonts.gstatic.com"> <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap" rel="stylesheet"> <link href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,400,0,0" rel="stylesheet"> <link rel="stylesheet" href="../static-assets/github.css?v1"> <link rel="stylesheet" href="../static-assets/styles.css?v1"> <link rel="icon" href="../static-assets/favicon.png?v1">  <script async src="https://www.googletagmanager.com/gtag/js?id=G-VVQ8908SJ5"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-VVQ8908SJ5'); </script> <link rel="preconnect" href="https://fonts.googleapis.com"> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="preload" href="https://fonts.googleapis.com/css2?family=Google+Sans+Text:wght@400&family=Google+Sans:wght@500&display=swap" as="style"> <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Google+Sans+Text:wght@400&family=Google+Sans:wght@500&display=swap"> <link rel="stylesheet" href="https://www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.css"> </head> <body data-base-href="../" data-using-base-href="false" class="light-theme"> <div id="overlay-under-drawer"></div> <header id="title"> menu <ol class="breadcrumbs gt-separated dark hidden-xs"> <li><a href="../index.html">Dart</a></li> <li><a href="../dart-collection">dart:collection</a></li> <li class="self-crumb">LinkedHashSet<E> class</li> </ol> <div class="self-name">LinkedHashSet</div> <form class="search navbar-right" role="search"> <input type="text" id="search-box" autocomplete="off" disabled class="form-control typeahead" placeholder="Loading search..."> </form> <div class="toggle" id="theme-button" title="Toggle brightness"> <label for="theme"> <input type="checkbox" id="theme" value="light-theme"> dark_mode light_mode </label> </div> </header> <main> <div id="dartdoc-main-content" class="main-content" data-above-sidebar="dart-collection/dart-collection-library-sidebar.html" data-below-sidebar="dart-collection/LinkedHashSet-class-sidebar.html"> <div> <div id="external-links" class="btn-group"><a title="View source code" class="source-link" href="https://github.com/dart-lang/sdk/blob/a8bfb132c5f7b9555d13ea79eaf0eaa77825824d/sdk/lib/collection/linked_hash_set.dart#L106">description</a></div> <h1>LinkedHashSet<E> class <a href="https://dart.dev/language/class-modifiers#abstract" class="feature feature-abstract" title="This type can not be directly constructed.">abstract</a> <a href="https://dart.dev/language/class-modifiers#final" class="feature feature-final" title="This class can neither be extended, implemented, nor mixed in.">final</a> </h1></div> <section class="desc markdown"> A <a href="../dart-collection/LinkedHashSet-class.html">LinkedHashSet</a> is a hash-table based <a href="../dart-core/Set-class.html">Set</a> implementation. The default implementation of <a href="../dart-core/Set-class.html">Set</a> is <a href="../dart-collection/LinkedHashSet-class.html">LinkedHashSet</a>. The <code>LinkedHashSet</code> also keeps track of the order that elements were inserted in, and iteration happens in first-to-last insertion order. The elements of a <code>LinkedHashSet</code> must have consistent <a href="../dart-core/Object/operator_equals.html">Object.==</a> and <a href="../dart-core/Object/hashCode.html">Object.hashCode</a> implementations. This means that the <code>==</code> operator must define a stable equivalence relation on the elements (reflexive, symmetric, transitive, and consistent over time), and that <code>hashCode</code> must be the same for objects that are considered equal by <code>==</code>. Iteration of elements is done in element insertion order. An element that was added after another will occur later in the iteration. Adding an element that is already in the set does not change its position in the iteration order, but removing an element and adding it again will make it the last element of an iteration. Most simple operations on <code>HashSet</code> are done in (potentially amortized) constant time: <a href="../dart-core/Set/add.html">add</a>, <a href="../dart-core/Set/contains.html">contains</a>, <a href="../dart-core/Set/remove.html">remove</a>, and <a href="../dart-core/Iterable/length.html">length</a>, provided the hash codes of objects are well distributed. Note: Do not modify a set (add or remove elements) while an operation is being performed on that set, for example in functions called during a <a href="../dart-collection/LinkedHashSet/forEach.html">forEach</a> or <a href="../dart-core/Set/containsAll.html">containsAll</a> call, or while iterating the set. Do not modify elements in a way which changes their equality (and thus their hash code) while they are in the set. Some specialized kinds of sets may be more permissive with regards to equality, in which case they should document their different behavior and restrictions. Example: <pre class="language-dart"><code class="language-dart">final planets = <String>{}; // LinkedHashSet </code></pre> To add data to a set, use <a href="../dart-core/Set/add.html">add</a> or <a href="../dart-core/Set/addAll.html">addAll</a>. <pre class="language-dart"><code class="language-dart">final uranusAdded = planets.add('Uranus'); // true planets.addAll({'Venus', 'Mars', 'Earth', 'Jupiter'}); print(planets); // {Uranus, Venus, Mars, Earth, Jupiter} </code></pre> To check if the set is empty, use <a href="../dart-core/Iterable/isEmpty.html">isEmpty</a> or <a href="../dart-core/Iterable/isNotEmpty.html">isNotEmpty</a>. To find the number of elements in the set, use <a href="../dart-core/Iterable/length.html">length</a>. <pre class="language-dart"><code class="language-dart">print(planets.isEmpty); // false print(planets.length); // 5 </code></pre> To check whether the set has an element with a specific value, use <a href="../dart-core/Set/contains.html">contains</a>. <pre class="language-dart"><code class="language-dart">final marsExists = planets.contains('Mars'); // true </code></pre> The <a href="../dart-collection/LinkedHashSet/forEach.html">forEach</a> method calls a function with each element of the set. <pre class="language-dart"><code class="language-dart">planets.forEach(print); // Uranus // Venus // Mars // Earth // Jupiter </code></pre> To make a copy of the set, use <a href="../dart-core/Set/toSet.html">toSet</a>. <pre class="language-dart"><code class="language-dart">final copySet = planets.toSet(); print(copySet); // {Uranus, Venus, Mars, Earth, Jupiter} </code></pre> To remove an element, use <a href="../dart-core/Set/remove.html">remove</a>. <pre class="language-dart"><code class="language-dart">final removedValue = planets.remove('Mars'); // Mars print(planets); // {Uranus, Venus, Earth, Jupiter} </code></pre> To remove multiple elements at the same time, use <a href="../dart-core/Set/removeWhere.html">removeWhere</a> or <a href="../dart-core/Set/removeAll.html">removeAll</a>. <pre class="language-dart"><code class="language-dart">planets.removeWhere((element) => element.startsWith('E')); print(planets); // {Uranus, Venus, Jupiter} </code></pre> To removes all elements in this set that do not meet a condition, use <a href="../dart-core/Set/retainWhere.html">retainWhere</a>. <pre class="language-dart"><code class="language-dart">planets.retainWhere((element) => element.contains('Jupiter')); print(planets); // {Jupiter} ```dart continued To remove all elements and empty the set, use [clear]. ```dart continued planets.clear(); print(planets.isEmpty); // true print(planets); // {} </code></pre> See also: <ul> <li><a href="../dart-core/Set-class.html">Set</a> is the general interface of collection where each object can occur only once.</li> <li><a href="../dart-collection/HashSet-class.html">HashSet</a> the order of the objects in the iteration is not guaranteed.</li> <li><a href="../dart-collection/SplayTreeSet-class.html">SplayTreeSet</a> iterates the objects in sorted order.</li> </ul> </section> <section> <dl class="dl-horizontal"> <dt>Implemented types</dt> <dd> <ul class="comma-separated clazz-relationships"> <li><a href="../dart-core/Set-class.html">Set</a><E></li> </ul> </dd> <dt>Available extensions</dt> <dd><ul class="comma-separated clazz-relationships"> <li><a href="../dart-core/EnumByName.html">EnumByName</a></li> <li><a href="../dart-async/FutureIterable.html">FutureIterable</a></li> <li><a href="../dart-collection/IterableExtensions.html">IterableExtensions</a></li> <li><a href="../dart-collection/NullableIterableExtensions.html">NullableIterableExtensions</a></li> </ul></dd> </dl> </section> <section class="summary offset-anchor" id="constructors"> <h2>Constructors</h2> <dl class="constructor-summary-list"> <dt id="LinkedHashSet" class="callable"> <a href="../dart-collection/LinkedHashSet/LinkedHashSet.html">LinkedHashSet</a>({<a href="../dart-core/bool-class.html">bool</a> equals(E, E)?, <a href="../dart-core/int-class.html">int</a> hashCode(E)?, <a href="../dart-core/bool-class.html">bool</a> isValidKey(dynamic)?}) </dt> <dd> Create an insertion-ordered hash set using the provided <code>equals</code> and <code>hashCode</code>. <div class="constructor-modifier features">factory</div> </dd> <dt id="LinkedHashSet.from" class="callable"> <a href="../dart-collection/LinkedHashSet/LinkedHashSet.from.html">LinkedHashSet.from</a>(<a href="../dart-core/Iterable-class.html">Iterable</a> elements) </dt> <dd> Create a linked hash set containing all <code>elements</code>. <div class="constructor-modifier features">factory</div> </dd> <dt id="LinkedHashSet.identity" class="callable"> <a href="../dart-collection/LinkedHashSet/LinkedHashSet.identity.html">LinkedHashSet.identity</a>() </dt> <dd> Creates an insertion-ordered identity-based set. <div class="constructor-modifier features">factory</div> </dd> <dt id="LinkedHashSet.of" class="callable"> <a href="../dart-collection/LinkedHashSet/LinkedHashSet.of.html">LinkedHashSet.of</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><E> elements) </dt> <dd> Create a linked hash set from <code>elements</code>. <div class="constructor-modifier features">factory</div> </dd> </dl> </section> <section class="summary offset-anchor" id="instance-properties"> <h2>Properties</h2> <dl class="properties"> <dt id="first" class="property inherited"> <a href="../dart-core/Iterable/first.html">first</a> → E </dt> <dd class="inherited"> The first element. <div class="features">no setterinherited</div> </dd> <dt id="firstOrNull" class="property"> <a href="../dart-collection/IterableExtensions/firstOrNull.html">firstOrNull</a> → T? </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-collection/IterableExtensions.html">IterableExtensions</a> extension The first element of this iterator, or <code>null</code> if the iterable is empty. <div class="features">no setter</div> </dd> <dt id="hashCode" class="property inherited"> <a href="../dart-core/Object/hashCode.html">hashCode</a> → <a href="../dart-core/int-class.html">int</a> </dt> <dd class="inherited"> The hash code for this object. <div class="features">no setterinherited</div> </dd> <dt id="indexed" class="property"> <a href="../dart-collection/IterableExtensions/indexed.html">indexed</a> → <a href="../dart-core/Iterable-class.html">Iterable</a><(<a href="../dart-core/int-class.html">int</a>, T)> </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-collection/IterableExtensions.html">IterableExtensions</a> extension Pairs of elements of the indices and elements of this iterable. <div class="features">no setter</div> </dd> <dt id="isEmpty" class="property inherited"> <a href="../dart-core/Iterable/isEmpty.html">isEmpty</a> → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Whether this collection has no elements. <div class="features">no setterinherited</div> </dd> <dt id="isNotEmpty" class="property inherited"> <a href="../dart-core/Iterable/isNotEmpty.html">isNotEmpty</a> → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Whether this collection has at least one element. <div class="features">no setterinherited</div> </dd> <dt id="iterator" class="property"> <a href="../dart-collection/LinkedHashSet/iterator.html">iterator</a> → <a href="../dart-core/Iterator-class.html">Iterator</a><E> </dt> <dd> Provides an iterator that iterates over the elements in insertion order. <div class="features">no setteroverride</div> </dd> <dt id="last" class="property inherited"> <a href="../dart-core/Iterable/last.html">last</a> → E </dt> <dd class="inherited"> The last element. <div class="features">no setterinherited</div> </dd> <dt id="lastOrNull" class="property"> <a href="../dart-collection/IterableExtensions/lastOrNull.html">lastOrNull</a> → T? </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-collection/IterableExtensions.html">IterableExtensions</a> extension The last element of this iterable, or <code>null</code> if the iterable is empty. <div class="features">no setter</div> </dd> <dt id="length" class="property inherited"> <a href="../dart-core/Iterable/length.html">length</a> → <a href="../dart-core/int-class.html">int</a> </dt> <dd class="inherited"> The number of elements in this <a href="../dart-core/Iterable-class.html">Iterable</a>. <div class="features">no setterinherited</div> </dd> <dt id="nonNulls" class="property"> <a href="../dart-collection/NullableIterableExtensions/nonNulls.html">nonNulls</a> → <a href="../dart-core/Iterable-class.html">Iterable</a><T> </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T?>, provided by the <a href="../dart-collection/NullableIterableExtensions.html">NullableIterableExtensions</a> extension The non-<code>null</code> elements of this iterable. <div class="features">no setter</div> </dd> <dt id="runtimeType" class="property inherited"> <a href="../dart-core/Object/runtimeType.html">runtimeType</a> → <a href="../dart-core/Type-class.html">Type</a> </dt> <dd class="inherited"> A representation of the runtime type of the object. <div class="features">no setterinherited</div> </dd> <dt id="single" class="property inherited"> <a href="../dart-core/Iterable/single.html">single</a> → E </dt> <dd class="inherited"> Checks that this iterable has only one element, and returns that element. <div class="features">no setterinherited</div> </dd> <dt id="singleOrNull" class="property"> <a href="../dart-collection/IterableExtensions/singleOrNull.html">singleOrNull</a> → T? </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-collection/IterableExtensions.html">IterableExtensions</a> extension The single element of this iterator, or <code>null</code>. <div class="features">no setter</div> </dd> <dt id="wait" class="property"> <a href="../dart-async/FutureIterable/wait.html">wait</a> → <a href="../dart-async/Future-class.html">Future</a><<a href="../dart-core/List-class.html">List</a><T>> </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><<a href="../dart-async/Future-class.html">Future</a><T>>, provided by the <a href="../dart-async/FutureIterable.html">FutureIterable</a> extension Waits for futures in parallel. <div class="features">no setter</div> </dd> </dl> </section> <section class="summary offset-anchor" id="instance-methods"> <h2>Methods</h2> <dl class="callables"> <dt id="add" class="callable inherited"> <a href="../dart-core/Set/add.html">add</a>(E value) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Adds <code>value</code> to the set. <div class="features">inherited</div> </dd> <dt id="addAll" class="callable inherited"> <a href="../dart-core/Set/addAll.html">addAll</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><E> elements) → void </dt> <dd class="inherited"> Adds all <code>elements</code> to this set. <div class="features">inherited</div> </dd> <dt id="any" class="callable inherited"> <a href="../dart-core/Iterable/any.html">any</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element)) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Checks whether any element of this iterable satisfies <code>test</code>. <div class="features">inherited</div> </dd> <dt id="asNameMap" class="callable"> <a href="../dart-core/EnumByName/asNameMap.html">asNameMap</a>() → <a href="../dart-core/Map-class.html">Map</a><<a href="../dart-core/String-class.html">String</a>, T> </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-core/EnumByName.html">EnumByName</a> extension Creates a map from the names of enum values to the values. </dd> <dt id="byName" class="callable"> <a href="../dart-core/EnumByName/byName.html">byName</a>(<a href="../dart-core/String-class.html">String</a> name) → T </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-core/EnumByName.html">EnumByName</a> extension Finds the enum value in this list with name <code>name</code>. </dd> <dt id="cast" class="callable inherited"> <a href="../dart-core/Set/cast.html">cast</a><R>() → <a href="../dart-core/Set-class.html">Set</a><R> </dt> <dd class="inherited"> Provides a view of this set as a set of <code>R</code> instances. <div class="features">inherited</div> </dd> <dt id="clear" class="callable inherited"> <a href="../dart-core/Set/clear.html">clear</a>() → void </dt> <dd class="inherited"> Removes all elements from the set. <div class="features">inherited</div> </dd> <dt id="contains" class="callable inherited"> <a href="../dart-core/Set/contains.html">contains</a>(<a href="../dart-core/Object-class.html">Object</a>? value) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Whether <code>value</code> is in the set. <div class="features">inherited</div> </dd> <dt id="containsAll" class="callable inherited"> <a href="../dart-core/Set/containsAll.html">containsAll</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><<a href="../dart-core/Object-class.html">Object</a>?> other) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Whether this set contains all the elements of <code>other</code>. <div class="features">inherited</div> </dd> <dt id="difference" class="callable inherited"> <a href="../dart-core/Set/difference.html">difference</a>(<a href="../dart-core/Set-class.html">Set</a><<a href="../dart-core/Object-class.html">Object</a>?> other) → <a href="../dart-core/Set-class.html">Set</a><E> </dt> <dd class="inherited"> Creates a new set with the elements of this that are not in <code>other</code>. <div class="features">inherited</div> </dd> <dt id="elementAt" class="callable inherited"> <a href="../dart-core/Iterable/elementAt.html">elementAt</a>(<a href="../dart-core/int-class.html">int</a> index) → E </dt> <dd class="inherited"> Returns the <code>index</code>th element. <div class="features">inherited</div> </dd> <dt id="elementAtOrNull" class="callable"> <a href="../dart-collection/IterableExtensions/elementAtOrNull.html">elementAtOrNull</a>(<a href="../dart-core/int-class.html">int</a> index) → T? </dt> <dd> Available on <a href="../dart-core/Iterable-class.html">Iterable</a><T>, provided by the <a href="../dart-collection/IterableExtensions.html">IterableExtensions</a> extension The element at position <code>index</code> of this iterable, or <code>null</code>. </dd> <dt id="every" class="callable inherited"> <a href="../dart-core/Iterable/every.html">every</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element)) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Checks whether every element of this iterable satisfies <code>test</code>. <div class="features">inherited</div> </dd> <dt id="expand" class="callable inherited"> <a href="../dart-core/Iterable/expand.html">expand</a><T>(<a href="../dart-core/Iterable-class.html">Iterable</a><T> toElements(E element)) → <a href="../dart-core/Iterable-class.html">Iterable</a><T> </dt> <dd class="inherited"> Expands each element of this <a href="../dart-core/Iterable-class.html">Iterable</a> into zero or more elements. <div class="features">inherited</div> </dd> <dt id="firstWhere" class="callable inherited"> <a href="../dart-core/Iterable/firstWhere.html">firstWhere</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element), {E orElse()?}) → E </dt> <dd class="inherited"> The first element that satisfies the given predicate <code>test</code>. <div class="features">inherited</div> </dd> <dt id="fold" class="callable inherited"> <a href="../dart-core/Iterable/fold.html">fold</a><T>(T initialValue, T combine(T previousValue, E element)) → T </dt> <dd class="inherited"> Reduces a collection to a single value by iteratively combining each element of the collection with an existing value <div class="features">inherited</div> </dd> <dt id="followedBy" class="callable inherited"> <a href="../dart-core/Iterable/followedBy.html">followedBy</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><E> other) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates the lazy concatenation of this iterable and <code>other</code>. <div class="features">inherited</div> </dd> <dt id="forEach" class="callable"> <a href="../dart-collection/LinkedHashSet/forEach.html">forEach</a>(void action(E element)) → void </dt> <dd> Executes a function on each element of the set. <div class="features">override</div> </dd> <dt id="intersection" class="callable inherited"> <a href="../dart-core/Set/intersection.html">intersection</a>(<a href="../dart-core/Set-class.html">Set</a><<a href="../dart-core/Object-class.html">Object</a>?> other) → <a href="../dart-core/Set-class.html">Set</a><E> </dt> <dd class="inherited"> Creates a new set which is the intersection between this set and <code>other</code>. <div class="features">inherited</div> </dd> <dt id="join" class="callable inherited"> <a href="../dart-core/Iterable/join.html">join</a>([<a href="../dart-core/String-class.html">String</a> separator = ""]) → <a href="../dart-core/String-class.html">String</a> </dt> <dd class="inherited"> Converts each element to a <a href="../dart-core/String-class.html">String</a> and concatenates the strings. <div class="features">inherited</div> </dd> <dt id="lastWhere" class="callable inherited"> <a href="../dart-core/Iterable/lastWhere.html">lastWhere</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element), {E orElse()?}) → E </dt> <dd class="inherited"> The last element that satisfies the given predicate <code>test</code>. <div class="features">inherited</div> </dd> <dt id="lookup" class="callable inherited"> <a href="../dart-core/Set/lookup.html">lookup</a>(<a href="../dart-core/Object-class.html">Object</a>? object) → E? </dt> <dd class="inherited"> If an object equal to <code>object</code> is in the set, return it. <div class="features">inherited</div> </dd> <dt id="map" class="callable inherited"> <a href="../dart-core/Iterable/map.html">map</a><T>(T toElement(E e)) → <a href="../dart-core/Iterable-class.html">Iterable</a><T> </dt> <dd class="inherited"> The current elements of this iterable modified by <code>toElement</code>. <div class="features">inherited</div> </dd> <dt id="noSuchMethod" class="callable inherited"> <a href="../dart-core/Object/noSuchMethod.html">noSuchMethod</a>(<a href="../dart-core/Invocation-class.html">Invocation</a> invocation) → dynamic </dt> <dd class="inherited"> Invoked when a nonexistent method or property is accessed. <div class="features">inherited</div> </dd> <dt id="reduce" class="callable inherited"> <a href="../dart-core/Iterable/reduce.html">reduce</a>(E combine(E value, E element)) → E </dt> <dd class="inherited"> Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. <div class="features">inherited</div> </dd> <dt id="remove" class="callable inherited"> <a href="../dart-core/Set/remove.html">remove</a>(<a href="../dart-core/Object-class.html">Object</a>? value) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> Removes <code>value</code> from the set. <div class="features">inherited</div> </dd> <dt id="removeAll" class="callable inherited"> <a href="../dart-core/Set/removeAll.html">removeAll</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><<a href="../dart-core/Object-class.html">Object</a>?> elements) → void </dt> <dd class="inherited"> Removes each element of <code>elements</code> from this set. <div class="features">inherited</div> </dd> <dt id="removeWhere" class="callable inherited"> <a href="../dart-core/Set/removeWhere.html">removeWhere</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element)) → void </dt> <dd class="inherited"> Removes all elements of this set that satisfy <code>test</code>. <div class="features">inherited</div> </dd> <dt id="retainAll" class="callable inherited"> <a href="../dart-core/Set/retainAll.html">retainAll</a>(<a href="../dart-core/Iterable-class.html">Iterable</a><<a href="../dart-core/Object-class.html">Object</a>?> elements) → void </dt> <dd class="inherited"> Removes all elements of this set that are not elements in <code>elements</code>. <div class="features">inherited</div> </dd> <dt id="retainWhere" class="callable inherited"> <a href="../dart-core/Set/retainWhere.html">retainWhere</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element)) → void </dt> <dd class="inherited"> Removes all elements of this set that fail to satisfy <code>test</code>. <div class="features">inherited</div> </dd> <dt id="singleWhere" class="callable inherited"> <a href="../dart-core/Iterable/singleWhere.html">singleWhere</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element), {E orElse()?}) → E </dt> <dd class="inherited"> The single element that satisfies <code>test</code>. <div class="features">inherited</div> </dd> <dt id="skip" class="callable inherited"> <a href="../dart-core/Iterable/skip.html">skip</a>(<a href="../dart-core/int-class.html">int</a> count) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates an <a href="../dart-core/Iterable-class.html">Iterable</a> that provides all but the first <code>count</code> elements. <div class="features">inherited</div> </dd> <dt id="skipWhile" class="callable inherited"> <a href="../dart-core/Iterable/skipWhile.html">skipWhile</a>(<a href="../dart-core/bool-class.html">bool</a> test(E value)) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates an <code>Iterable</code> that skips leading elements while <code>test</code> is satisfied. <div class="features">inherited</div> </dd> <dt id="take" class="callable inherited"> <a href="../dart-core/Iterable/take.html">take</a>(<a href="../dart-core/int-class.html">int</a> count) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates a lazy iterable of the <code>count</code> first elements of this iterable. <div class="features">inherited</div> </dd> <dt id="takeWhile" class="callable inherited"> <a href="../dart-core/Iterable/takeWhile.html">takeWhile</a>(<a href="../dart-core/bool-class.html">bool</a> test(E value)) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates a lazy iterable of the leading elements satisfying <code>test</code>. <div class="features">inherited</div> </dd> <dt id="toList" class="callable inherited"> <a href="../dart-core/Iterable/toList.html">toList</a>({<a href="../dart-core/bool-class.html">bool</a> growable = true}) → <a href="../dart-core/List-class.html">List</a><E> </dt> <dd class="inherited"> Creates a <a href="../dart-core/List-class.html">List</a> containing the elements of this <a href="../dart-core/Iterable-class.html">Iterable</a>. <div class="features">inherited</div> </dd> <dt id="toSet" class="callable inherited"> <a href="../dart-core/Set/toSet.html">toSet</a>() → <a href="../dart-core/Set-class.html">Set</a><E> </dt> <dd class="inherited"> Creates a <a href="../dart-core/Set-class.html">Set</a> with the same elements and behavior as this <code>Set</code>. <div class="features">inherited</div> </dd> <dt id="toString" class="callable inherited"> <a href="../dart-core/Object/toString.html">toString</a>() → <a href="../dart-core/String-class.html">String</a> </dt> <dd class="inherited"> A string representation of this object. <div class="features">inherited</div> </dd> <dt id="union" class="callable inherited"> <a href="../dart-core/Set/union.html">union</a>(<a href="../dart-core/Set-class.html">Set</a><E> other) → <a href="../dart-core/Set-class.html">Set</a><E> </dt> <dd class="inherited"> Creates a new set which contains all the elements of this set and <code>other</code>. <div class="features">inherited</div> </dd> <dt id="where" class="callable inherited"> <a href="../dart-core/Iterable/where.html">where</a>(<a href="../dart-core/bool-class.html">bool</a> test(E element)) → <a href="../dart-core/Iterable-class.html">Iterable</a><E> </dt> <dd class="inherited"> Creates a new lazy <a href="../dart-core/Iterable-class.html">Iterable</a> with all elements that satisfy the predicate <code>test</code>. <div class="features">inherited</div> </dd> <dt id="whereType" class="callable inherited"> <a href="../dart-core/Iterable/whereType.html">whereType</a><T>() → <a href="../dart-core/Iterable-class.html">Iterable</a><T> </dt> <dd class="inherited"> Creates a new lazy <a href="../dart-core/Iterable-class.html">Iterable</a> with all elements that have type <code>T</code>. <div class="features">inherited</div> </dd> </dl> </section> <section class="summary offset-anchor inherited" id="operators"> <h2>Operators</h2> <dl class="callables"> <dt id="operator ==" class="callable inherited"> <a href="../dart-core/Object/operator_equals.html">operator ==</a>(<a href="../dart-core/Object-class.html">Object</a> other) → <a href="../dart-core/bool-class.html">bool</a> </dt> <dd class="inherited"> The equality operator. <div class="features">inherited</div> </dd> </dl> </section> </div>  <div id="dartdoc-sidebar-left" class="sidebar sidebar-offcanvas-left">  <header id="header-search-sidebar" class="hidden-l"> <form class="search-sidebar" role="search"> <input type="text" id="search-sidebar" autocomplete="off" disabled class="form-control typeahead" placeholder="Loading search..."> </form> </header> <ol class="breadcrumbs gt-separated dark hidden-l" id="sidebar-nav"> <li><a href="../index.html">Dart</a></li> <li><a href="../dart-collection">dart:collection</a></li> <li class="self-crumb">LinkedHashSet<E> class</li> </ol> <h5>dart:collection library</h5> <div id="dartdoc-sidebar-left-content"></div> </div> <div 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