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    <p><strong>UPDATE (Nov 24th, 2015):</strong></p> <p>This answer is originally posted in the year 2010 (SIX years back.) so please take note of these insightful comments:</p> <ul> <li><p><a href="https://stackoverflow.com/users/570040/shauna">Shauna</a> - Update for Googlers - Looks like ECMA6 adds this function. The MDN article also shows a polyfill. <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith" rel="noreferrer">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith</a></p></li> <li><p><a href="https://stackoverflow.com/users/157247/t-j-crowder">T.J. Crowder</a> - Creating substrings isn't expensive on modern browsers; it may well have been in 2010 when this answer was posted. These days, the simple <code>this.substr(-suffix.length) === suffix</code> approach is fastest on Chrome, the same on IE11 as indexOf, and only 4% slower (fergetaboutit territory) on Firefox: <a href="http://jsperf.com/endswith-stackoverflow/14" rel="noreferrer">jsperf.com/endswith-stackoverflow/14</a> And faster across the board when the result is false: <a href="http://jsperf.com/endswith-stackoverflow-when-false" rel="noreferrer">jsperf.com/endswith-stackoverflow-when-false</a> <strong>Of course, with ES6 adding endsWith, the point is moot. :-)</strong></p></li> </ul> <hr> <p><strong>ORIGINAL ANSWER:</strong></p> <p>I know this is a year old question... but I need this too and I need it to work cross-browser so... <strong>combining everyone's answer and comments</strong> and simplifying it a bit:</p> <pre><code>String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; }; </code></pre> <ul> <li>Doesn't create a substring</li> <li>Uses native <code>indexOf</code> function for fastest results</li> <li>Skip unnecessary comparisons using the second parameter of <code>indexOf</code> to skip ahead</li> <li>Works in Internet Explorer</li> <li>NO Regex complications</li> </ul> <hr> <p>Also, if you don't like stuffing things in native data structure's prototypes, here's a standalone version:</p> <pre><code>function endsWith(str, suffix) { return str.indexOf(suffix, str.length - suffix.length) !== -1; } </code></pre> <hr> <p><strong>EDIT:</strong> As noted by @hamish in the comments, if you want to err on the safe side and check if an implementation has already been provided, you can just adds a <code>typeof</code> check like so:</p> <pre><code>if (typeof String.prototype.endsWith !== 'function') { String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; }; } </code></pre>
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    1. COUpdate for Googlers - Looks like ECMA6 adds this function. The MDN article also shows a polyfill. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
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    3. CO@lukas.pukenis it skips to the end and only check one instance of the suffix at the very end. it doesn't matter if the search string appears elsewhere.
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