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Id
3884293
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0
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0
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2
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CreationDate
2010-10-07T17:40:39.547
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2016-05-05T19:13:05.013
LastEditDate
2016-05-05T19:13:05.013
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2869791
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113716
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2
Score
25
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0
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text
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To my knowledge, there isn't a built-in <code>then()</code> method in <code>javascript</code> (at the time of this writing). It appears that whatever it is that <code>doSome("task")</code> is returning has a method called <code>then</code>. If you log the return result of <code>doSome()</code> to the console, you should be able to see the properties of what was returned. <pre><code>console.log( myObj.doSome("task") ); // Expand the returned object in the // console to see its properties. </code></pre> UPDATE (As of ECMAScript6) :- The <code>.then()</code> function has been included to pure javascript. From the Mozilla documentation <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then" rel="noreferrer">here</a>, <blockquote> The then() method returns a Promise. It takes two arguments: callback functions for the success and failure cases of the Promise. </blockquote> The Promise object, in turn, is defined as <blockquote> The Promise object is used for deferred and asynchronous computations. A Promise represents an operation that hasn't completed yet, but is expected in the future. </blockquote> That is, the <code>Promise</code> acts as a placeholder for a value that is not yet computed, but shall be resolved in the future. And the <code>.then()</code> function is used to associate the functions to be invoked on the Promise when it is resolved - either as a success or a failure.
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1. POWhat does the function then() mean in JavaScript?
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1. USSarathChandra
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1. USuser113716
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1. COThere wasn't a built-in `.then` back then, but native promises are coming now in ES6: http://www.html5rocks.com/en/tutorials/es6/promises/
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