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                <h1 id="data-structures-javascript-api">Data Structures - JavaScript API<a class="headerlink" href="#data-structures-javascript-api" title="Permanent link">#</a></h1>
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link">#</a></h2>
<p>JavaScript offers only limited types of collections to hold and iterate over
data. Despite the ongoing efforts in ES6 and newer, these new data structures
and access methods, such as <code>for … of</code>, are not available in the still supported
Internet Explorer 11.</p>
<h2 id="dictionary"><code>Dictionary</code><a class="headerlink" href="#dictionary" title="Permanent link">#</a></h2>
<p>Represents a simple key-value map, but unlike the use of plain objects, will
always to guarantee to iterate over directly set values only.</p>
<p><em>In supported browsers this will use a native <code>Map</code> internally, otherwise a plain object.</em></p>
<h3 id="setkey-string-value-any"><code>set(key: string, value: any)</code><a class="headerlink" href="#setkey-string-value-any" title="Permanent link">#</a></h3>
<p>Adds or updates an item using the provided key. Numeric keys will be converted
into strings.</p>
<h3 id="deletekey-string"><code>delete(key: string)</code><a class="headerlink" href="#deletekey-string" title="Permanent link">#</a></h3>
<p>Removes an item from the collection.</p>
<h3 id="haskey-string-boolean"><code>has(key: string): boolean</code><a class="headerlink" href="#haskey-string-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the key is contained in the collection.</p>
<h3 id="getkey-string-any"><code>get(key: string): any</code><a class="headerlink" href="#getkey-string-any" title="Permanent link">#</a></h3>
<p>Returns the value for the provided key, or <code>undefined</code> if the key was not found.
Use <code>.has()</code> to check for key existence.</p>
<h3 id="foreachcallback-value-any-key-string-void"><code>forEach(callback: (value: any, key: string) =&gt; void)</code><a class="headerlink" href="#foreachcallback-value-any-key-string-void" title="Permanent link">#</a></h3>
<p>Iterates over all items in the collection in an arbitrary order and invokes the
supplied callback with the value and the key.</p>
<h3 id="size-number"><code>size: number</code><a class="headerlink" href="#size-number" title="Permanent link">#</a></h3>
<p>This read-only property counts the number of items in the collection.</p>
<h2 id="list"><code>List</code><a class="headerlink" href="#list" title="Permanent link">#</a></h2>
<p>Represents a list of unique values.</p>
<p><em>In supported browsers this will use a native <code>Set</code> internally, otherwise an array.</em></p>
<h3 id="addvalue-any"><code>add(value: any)</code><a class="headerlink" href="#addvalue-any" title="Permanent link">#</a></h3>
<p>Adds a value to the list. If the value is already part of the list, this method
will silently abort.</p>
<h3 id="clear"><code>clear()</code><a class="headerlink" href="#clear" title="Permanent link">#</a></h3>
<p>Resets the collection.</p>
<h3 id="deletevalue-any-boolean"><code>delete(value: any): boolean</code><a class="headerlink" href="#deletevalue-any-boolean" title="Permanent link">#</a></h3>
<p>Attempts to remove a value from the list, it returns true if the value has been
part of the list.</p>
<h3 id="foreachcallback-value-any-void"><code>forEach(callback: (value: any) =&gt; void)</code><a class="headerlink" href="#foreachcallback-value-any-void" title="Permanent link">#</a></h3>
<p>Iterates over all values in the list in an arbitrary order and invokes the
supplied callback for each value.</p>
<h3 id="hasvalue-any-boolean"><code>has(value: any): boolean</code><a class="headerlink" href="#hasvalue-any-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the provided value is part of this list.</p>
<h3 id="size-number_1"><code>size: number</code><a class="headerlink" href="#size-number_1" title="Permanent link">#</a></h3>
<p>This read-only property counts the number of items in the list.</p>
<h2 id="objectmap"><code>ObjectMap</code><a class="headerlink" href="#objectmap" title="Permanent link">#</a></h2>
<div class="admonition info">
<p class="admonition-title">This class uses a <code>WeakMap</code> internally, the keys are only weakly referenced and do not prevent garbage collection.</p>
</div>
<p>Represents a collection where any kind of objects, such as class instances or
DOM elements, can be used as key. These keys are weakly referenced and will not
prevent garbage collection from happening, but this also means that it is not
possible to enumerate or iterate over the stored keys and values.</p>
<p>This class is especially useful when you want to store additional data for
objects that may get disposed on runtime, such as DOM elements. Using any regular
data collections will cause the object to be referenced indefinitely, preventing
the garbage collection from removing orphaned objects.</p>
<h3 id="setkey-object-value-object"><code>set(key: Object, value: Object)</code><a class="headerlink" href="#setkey-object-value-object" title="Permanent link">#</a></h3>
<p>Adds the key with the provided value to the map, if the key was already part
of the collection, its value is overwritten.</p>
<h3 id="deletekey-object"><code>delete(key: Object)</code><a class="headerlink" href="#deletekey-object" title="Permanent link">#</a></h3>
<p>Attempts to remove a key from the collection. The method will abort silently if
the key is not part of the collection.</p>
<h3 id="haskey-object-boolean"><code>has(key: Object): boolean</code><a class="headerlink" href="#haskey-object-boolean" title="Permanent link">#</a></h3>
<p>Returns true if there is a value for the provided key in this collection.</p>
<h3 id="getkey-object-object-undefined"><code>get(key: Object): Object | undefined</code><a class="headerlink" href="#getkey-object-object-undefined" title="Permanent link">#</a></h3>
<p>Retrieves the value of the provided key, or <code>undefined</code> if the key was not found.</p>
                
                  
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