Revision 705909 of StopIteration

<div class="warning">
 The <code><strong>StopIteration</strong></code> is a SpiderMonkey-specific feature. For future-facing usages, consider using <a href="/en-US/docs/Web/JavaScript/Reference/Statements/for...of" title="/en-US/docs/Web/JavaScript/Reference/Statements/for...of">for..of</a> loops and the <a href="/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol">iterator protocol</a></div>
<h2 id="Summary">Summary</h2>
<p>The <code><strong>StopIteration</strong></code> object is used to tell the end of iteration in legacy iterator protocol.</p>
<h2 id="Syntax" name="Syntax">Syntax</h2>
<pre class="syntaxbox">
Iterator</pre>
<h2 id="Description">Description</h2>
<p>An overview of the usage is available on the <a href="/en-US/docs/JavaScript/Guide/Iterators_and_Generators" title="/en-US/docs/JavaScript/Guide/Iterators_and_Generators">Iterators and Generators</a> page.</p>
<h2 id="Examples">Examples</h2>
<p><code>StopIteration</code> thrown by <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Iterator"><code>Iterator</code></a>.</p>
<pre>
var a = {
  x: 10,
  y: 20,
};
var iter = Iterator(a);
console.log(iter.next()); // ["x", 10]
console.log(iter.next()); // ["y", 20]
console.log(iter.next()); // throws StopIteration
</pre>
<p>Stop iteration by throwing <code>StopIteration</code>.</p>
<pre>
function f() {
  yield 1;
  yield 2;
  throw StopIteration;
  yield 3; // this is not executed.
}
for (var n in f()) {
  console.log(n);   // 1
                    // 2
}
</pre>
<h2 id="See_also">See also</h2>
<ul>
 <li><a href="/en-US/docs/JavaScript/Guide/Iterators_and_Generators" title="/en-US/docs/JavaScript/Guide/Iterators_and_Generators">Iterators and Generators</a></li>
 <li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Iterator">Iterator</a></li>
</ul>