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    <p>First, implement <code>indexOf</code> in JavaScript for browsers that don't already have it. For example, see <a href="http://erik.eae.net/playground/arrayextras/arrayextras.js" rel="noreferrer">Erik Arvidsson's array extras</a> (also, the <a href="http://erik.eae.net/archives/2005/06/05/17.53.19/" rel="noreferrer">associated blog post</a>). And then you can use <code>indexOf</code> without worrying about browser support. Here's a slightly optimised version of his <code>indexOf</code> implementation:</p> <pre><code>if (!Array.prototype.indexOf) { Array.prototype.indexOf = function (obj, fromIndex) { if (fromIndex == null) { fromIndex = 0; } else if (fromIndex &lt; 0) { fromIndex = Math.max(0, this.length + fromIndex); } for (var i = fromIndex, j = this.length; i &lt; j; i++) { if (this[i] === obj) return i; } return -1; }; } </code></pre> <p>It's changed to store the length so that it doesn't need to look it up every iteration. But the difference isn't huge. A less general purpose function might be faster:</p> <pre><code>var include = Array.prototype.indexOf ? function(arr, obj) { return arr.indexOf(obj) !== -1; } : function(arr, obj) { for(var i = -1, j = arr.length; ++i &lt; j;) if(arr[i] === obj) return true; return false; }; </code></pre> <p>I prefer using the standard function and leaving this sort of micro-optimization for when it's really needed. But if you're keen on micro-optimization I adapted the <a href="https://blogs.oracle.com/greimer/resource/loop-test.html" rel="noreferrer">benchmarks</a> that roosterononacid linked to in the comments, to <a href="http://obscurity.nfshost.com/x/bench.html" rel="noreferrer">benchmark searching in arrays</a>. They're pretty crude though, a full investigation would test arrays with different types, different lengths and finding objects that occur in different places.</p>
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    1. POBest way to find if an item is in a JavaScript array?
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    1. USDaniel James
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    1. COThe code examples you are linking to are slow on large arrays. See the comments in my implementation example of a hasItem() function.
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    2. COTake a look at these benchmarks: http://blogs.sun.com/greimer/resource/loop-test.htm For-loops are slow. But I guess the arrays used in the benchmarks are pretty huge :)
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    3. COhttp://blogs.sun.com/greimer/resource/loop-test.html
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