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16206139
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0
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0
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0
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2013-04-25T03:59:55.173
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0
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2013-04-25T04:58:41.130
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2013-04-25T04:58:41.130
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227299
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227299
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16205835
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2
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3
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text
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If you want something to happen at the beginning of a function, you can use the following. You do have access to <code>this</code> and the arguments from your injected function. So it will still work for functions that require a specific context. <pre><code>function inject(before, fn) { return function(){ before.apply(this, arguments); fn.apply (this, arguments); } } </code></pre> For example <pre><code>function add(a, b) { return a + b; } function concat(a, b) { return a + b; } /** * You can repeat index and type to check multiple arguments */ function createArgumentChecker(index, type /**index, type, ... */) { var originalArgs = arguments; return function() { for (var i=0; i < originalArgs.length; i+=2) { var index = originalArgs[i], requestedType = originalArgs[i+1], actualType = typeof arguments[index]; if (typeAtIndex != actualType) { console.log("Invalid argument passed at index " + index + ". Expected type " + requestedType + "but it's " + actualType ); } } } } function logArguments() { console.log(this, arguments); } // Inject an argument checker add = inject(add, createArgumentChecker(0,"number", 1, "number")); concat = inject (concat, createArgumentChecker(0, "string", 1, "string")); // You can even do it multiple times, inject an argument logger; add = inject(add, logArguments); concat = inject(concat, logArguments); </code></pre> <a href="http://jsfiddle.net/sDBJ9/" rel="nofollow">JSfiddle</a> This can be handy when debugging websites that you can't modify the source code, I wouldn't use it do parameter checking unless you can strip it our for the production version.
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1. POInsert a line into a function in JavaScript
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1. USJuan Mendes
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