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<b>GoJS</b>&reg; Diagramming Components<br/>version 2.0.17<br/>by <a href="https://www.nwoods.com/">Northwoods Software&reg;</a>
</div>
<div>
<h1>Interface Iterator&lt;T&gt;</h1>
</div>
</div>
</div>
</div>
</header>
<div class="container-fluid container-main plr15">
<div class="row">
<div class="col-8 col-content">
<section class="tsd-panel tsd-hierarchy">
<h3>Hierarchy</h3>
<ul class="tsd-hierarchy">
<li>
<a href="Iterable.html" class="tsd-signature-type">Iterable</a><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">&gt;</span>
<ul class="tsd-hierarchy">
<li>
<span class="target">Iterator</span>
</li>
</ul>
</li>
</ul>
</section>
<section class="tsd-panel tsd-comment">
<div class="tsd-comment tsd-typography">
<p>This interface defines properties and methods for iterating over a collection;
it provides the <a href="Iterator.html#next">next</a> predicate and the <a href="Iterator.html#value">value</a> read-only property.
Some Iterators also provide <code>key</code> property values along with each <code>value</code>.</p>
<p>Typical usage is:</p>
<pre><code class="hljs js"> <span class="hljs-keyword">var</span> it = anIterableCollection.iterator;
<span class="hljs-keyword">while</span> (it.next()) {
<span class="hljs-keyword">var</span> item = it.value;
}</code></pre>
<p>Many iterators will signal an error if <a href="Iterator.html#next">next</a> is called
after the underlying collection has been modified.</p>
<p>To avoid confusion when dealing with <a href="Iterable.html">Iterable</a>s,
iterators implement the <a href="Iterable.html#iterator">Iterable.iterator</a> property
by just returning themselves.</p>
</div>
</section>
<section class="tsd-panel tsd-type-parameters">
<h3>Type parameters</h3>
<ul class="tsd-type-parameters">
<li>
<h4>T</h4>
</li>
</ul>
</section>
<section class="tsd-panel-group tsd-index-group">
<h2>Index</h2>
<section class="tsd-panel tsd-index-panel">
<div class="tsd-index-content">
<section class="tsd-index-section ">
<h3>Properties</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-property tsd-parent-kind-interface"><a href="Iterator.html#count" class="tsd-kind-icon">count</a></li>
<li class="tsd-kind-property tsd-parent-kind-interface"><a href="Iterator.html#iterator" class="tsd-kind-icon">iterator</a></li>
<li class="tsd-kind-property tsd-parent-kind-interface"><a href="Iterator.html#key" class="tsd-kind-icon">key</a></li>
<li class="tsd-kind-property tsd-parent-kind-interface"><a href="Iterator.html#value" class="tsd-kind-icon">value</a></li>
</ul>
</section>
<section class="tsd-index-section ">
<h3>Methods</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#all" class="tsd-kind-icon">all</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#any" class="tsd-kind-icon">any</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#each" class="tsd-kind-icon">each</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#first" class="tsd-kind-icon">first</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#next" class="tsd-kind-icon">next</a></li>
<li class="tsd-kind-method tsd-parent-kind-interface"><a href="Iterator.html#reset" class="tsd-kind-icon">reset</a></li>
</ul>
</section>
</div>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Properties</h2>
<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
<a name="count" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagOverride">Override</span>
count
<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span> </h3>
<div class="tsd-comment tsd-typography">
<p>This read-only property is the total number of items in the iterated collection.</p>
</div>
</section>
<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
<a name="iterator" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagOverride">Override</span>
iterator
<span class="tsd-signature-symbol">: </span><a href="Iterator.html" class="tsd-signature-type">Iterator</a><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">&gt;</span> </h3>
<div class="tsd-comment tsd-typography">
<p>Returns itself, which is convenient for code that expects an <a href="Iterable.html">Iterable</a>
instead of an <a href="Iterator.html">Iterator</a>.</p>
</div>
</section>
<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
<a name="key" class="tsd-anchor"></a>
<h3>
key
<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span> </h3>
<div class="tsd-comment tsd-typography">
<p>Gets the current index to the item in the collection, assuming <a href="Iterator.html#next">next</a> has just returned true.</p>
</div>
</section>
<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
<a name="value" class="tsd-anchor"></a>
<h3>
value
<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span> </h3>
<div class="tsd-comment tsd-typography">
<p>Gets the current item in the collection, assuming <a href="Iterator.html#next">next</a> has just returned true.</p>
</div>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Methods</h2>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="all" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagVirtual">Virtual</span>
all
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">all<span class="tsd-signature-symbol">(</span>pred<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>This is true if all invocations of the given predicate on items in the collection are true.</p>
<p>Call the given predicate on each item in the collection.
As soon as a call returns false, this returns false.
Otherwise this returns true.
For an empty collection this returns true.</p>
<p>This automatically <a href="Iterator.html#reset">reset</a>&#39;s itself when it is called.</p>
<dl class="tsd-comment-tags">
<dt>since</dt>
<dd><p>1.4</p>
</dd>
</dl>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>pred: <span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></h5>
<div class="tsd-comment tsd-typography">
<p>This function must not have any side-effects.</p>
</div>
<ul class="tsd-parameters">
</ul>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
<p>True if all predicate calls are true; false otherwise.</p>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="any" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagVirtual">Virtual</span>
any
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">any<span class="tsd-signature-symbol">(</span>pred<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>This is true if any invocation of the given predicate on items in the collection is true.</p>
<p>Call the given predicate on each item in the collection.
As soon as a call returns true, this returns true.
Otherwise this returns false.
For an empty collection this returns false.</p>
<p>This automatically <a href="Iterator.html#reset">reset</a>&#39;s itself when it is called.</p>
<dl class="tsd-comment-tags">
<dt>since</dt>
<dd><p>1.4</p>
</dd>
</dl>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>pred: <span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></h5>
<div class="tsd-comment tsd-typography">
<p>This function must not have any side-effects.</p>
</div>
<ul class="tsd-parameters">
</ul>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
<p>True if any predicate call is true; false otherwise.</p>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="each" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagVirtual">Virtual</span>
each
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">each<span class="tsd-signature-symbol">(</span>func<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Call the given function on each item in the collection.</p>
<p>This automatically <a href="Iterator.html#reset">reset</a>&#39;s itself when it is called.</p>
<dl class="tsd-comment-tags">
<dt>since</dt>
<dd><p>1.4</p>
</dd>
</dl>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>func: <span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">x</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></h5>
<div class="tsd-comment tsd-typography">
<p>This function must not modify the collection.</p>
</div>
<ul class="tsd-parameters">
</ul>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
<p>this iterator itself</p>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="first" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagOverride">Override</span>
first
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">first<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">null</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Advance if needed to the first item in the collection and return it, or return null if there is none.</p>
<p>Caution: this returns a <em>key/value pair</em>, not a <em>value</em>, for <a href="Map.html">Map</a> iterators.</p>
<dl class="tsd-comment-tags">
<dt>since</dt>
<dd><p>1.1</p>
</dd>
</dl>
</div>
<h4 class="tsd-returns-title">Returns
<span class="tsd-signature-type">T</span>
<span class="tsd-signature-symbol"> | </span>
<span class="tsd-signature-type">null</span>
</h4>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="next" class="tsd-anchor"></a>
<h3>
next
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">next<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Call this method to advance the iterator to the next item in the collection.
This should be called before accessing any <a href="Iterator.html#value">value</a>.</p>
</div>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
<p>whether another item is available; when true the value of <a href="Iterator.html#value">value</a> will be that item.</p>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
<a name="reset" class="tsd-anchor"></a>
<h3>
reset
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
<li class="tsd-signature tsd-kind-icon">reset<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Start this iterator all over again.</p>
</div>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
</li>
</ul>
</section>
</section>
</div>
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<nav class="tsd-navigation primary">
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<ul class="before-current">
</ul>
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<ul>
<li class=" tsd-kind-property tsd-parent-kind-interface">
<a href="Iterator.html#count" class="tsd-kind-icon">count</a>
</li>
<li class=" tsd-kind-property tsd-parent-kind-interface">
<a href="Iterator.html#iterator" class="tsd-kind-icon">iterator</a>
</li>
<li class=" tsd-kind-property tsd-parent-kind-interface">
<a href="Iterator.html#key" class="tsd-kind-icon">key</a>
</li>
<li class=" tsd-kind-property tsd-parent-kind-interface">
<a href="Iterator.html#value" class="tsd-kind-icon">value</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#all" class="tsd-kind-icon">all</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#any" class="tsd-kind-icon">any</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#each" class="tsd-kind-icon">each</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#first" class="tsd-kind-icon">first</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#next" class="tsd-kind-icon">next</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-interface">
<a href="Iterator.html#reset" class="tsd-kind-icon">reset</a>
</li>
</ul>
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