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    <blockquote> <p><em>"Is there a way to check of clearTimeout was successful."</em></p> </blockquote> <p>No, there's no state maintained that you can check, but if you manage your timers properly, it shouldn't be an issue.</p> <hr> <p>You could create your own stateful timer object I suppose...</p> <pre><code>var _slice = Array.prototype.slice; // substitute for setTimeout function myTimer(fn,ms) { var args = _slice.call(arguments,2), timer_state = { complete: false, timer: setTimeout(function() { timer_state.complete = true; fn.apply(this, args); }, ms) }; return timer_state; }; // substitute for clearTimeout function clearMyTimer(timer_obj) { timer_obj.complete = true; clearTimeout(timer_obj.timer); }; </code></pre> <p>Example of clearing the timer...</p> <pre><code> // create a timer var timer = myTimer( function() { console.log('timer is done'); }, 1000); console.log( timer.complete ); // complete? false clearMyTimer( timer ); // clear it console.log( timer.complete ); // complete? true </code></pre> <p>Example of letting it run...</p> <pre><code> // create a timer var timer = myTimer( function() { console.log('timer is done'); }, 1000); console.log( timer.complete ); // complete? false // check the timer object after it has expired setTimeout(function() { console.log( timer.complete ); // complete? true }, 1500); </code></pre> <hr> <p><em>EDIT: Updated to make <code>this</code> consistent in strict mode, and to support additional argument passed through to the callback. Thanks to <a href="https://stackoverflow.com/users/798880/saxoier">@Saxoier</a> for the note.</em></p>
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    1. CO`myTimer` will break if you run the code in a strict environment (`'use strict'`) and use `this` in the function. In addition passed arguments after the delay-arg will be ignored. Additional arguments might be standardized in HTML 5 - already implemented in Firefox, Chrome and Opera but can easily be implemented in environments that don't support it. [jsFiddle](http://jsfiddle.net/w3p8T/)
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    2. CO@Saxoier: Good points. I updated. Applied the extra args directly to the callback instead of the `setTimeout`, so the args will work in typically unsupported browsers.
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