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<!DOCTYPE html>
<html lang="en" dir="ltr" class="client-nojs with-toc">
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<meta charset="UTF-8" />
<title>join · WebPlatform Docs</title>
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<h1>join</h1>
<h2>Summary</h2>
<p>Adds all the elements of an array separated by the specified separator string.</p>
<h2>Syntax</h2>
<pre><code>join([ separator ])
</code></pre>
<dl>
<dt><strong>separator</strong></dt>
<dd>Optional. A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
</dd>
</dl>
<h2>Examples</h2>
<p>The following example illustrates the use of the <strong>join</strong> method.</p>
<pre><code class="js"><span class="hljs-keyword">var</span> a, b;
a = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Array</span>(<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>);
b = a.join( <span class="hljs-string">"-"</span> ) ;
<span class="hljs-built_in">document</span>.write(b);
<span class="hljs-comment">// Output:</span>
<span class="hljs-comment">// 0-1-2-3-4</span>
</code></pre>
<h2>Remarks</h2>
<p>If any element of the array is <strong>undefined</strong> or null , it is treated as an empty string.</p>
<h2>See also</h2>
<h3>Specification</h3>
<p><a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.4.4.5">15.4.4.5 Array.prototype.join (separator)</a> ECMAScript® Language Specification Standard ECMA-262 5.1 Edition / June 2011</p>
<h2>Attributions</h2>
<ul>
<li><p>Microsoft Developer Network: <a href="http://msdn.microsoft.com/en-us/library/ie/59x7k999(v=vs.94).aspx">Article</a></p>
</li>
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