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16929695
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0
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0
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CreationDate
2013-06-05T00:32:03.570
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2013-06-05T00:49:41.563
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2013-06-05T00:49:41.563
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2246674
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2246674
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16929673
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2
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1
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text
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<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply" rel="nofollow"><code>Function.apply</code></a> can only be used to apply an array-like object1 to a function call. There is no equivalent to Pythons "keyword argument expansion" and this must be done manually: <pre><code>var opts = { dos: 'foo', tres: 'bar', uno: 'baz' } doSomething(opts.uno, opts.dos, opts.tres) </code></pre> If we started with an array-like object: <pre><code>var arr = ['baz', 'foo', 'bar'] doSomething.apply(window, arr) </code></pre> Or putting the two together (so that the composition of to a parameter sequence can be handled earlier): <pre><code>var arr = [opts.uno, opts.dos, opts.tres] doSomething.apply(window, arr) </code></pre> While it may be possible (with non-obfuscated code) to use <a href="http://es5.github.io/#x15.3.4.2" rel="nofollow"><code>Function.toString</code></a>2 to extract the parameter names, do some parsing, and then write some code to "apply" a general object (or construct an array that is then applied), this is not supported directly by the ECMAScript specification. <hr> 1 An array-like object is one that has a <code>length</code> and properties named <code>0..length-1</code>. (Old versions of FF had a bug, but that has been fixed for a long time.) 2 The wording of the specification ("An implementation-dependent representation of the function is returned. This representation has the syntax of a FunctionDeclaration..") makes me believe that a conforming ES5 implementation ought to produce output usable for this purpose - however, this will likely vary by implementation and I have not explored such usage in practice.
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1. POHow do I call a javascript function given a mapping of variables to values?
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1. USuser2246674
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1. USuser2246674
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