A Log on JavaScript » arguments http://www.jslog.com Thu, 21 Jul 2011 11:00:10 +0000 http://wordpress.org/?v=2.9 en hourly 1 Function arguments http://www.jslog.com/function-arguments http://www.jslog.com/function-arguments#comments Mon, 31 May 2010 09:32:17 +0000 radu http://www.jslog.com/?p=209 Well, if you are programming in JavaScript for a while, you are familiar with the arguments ‘array’ which gives you access to function arguments by index, without the need of argument names. And if you are programming JavaScript for a bit longer while, you will know that arguments is not even a normal array. It does not have any methods of an array. You can just use it to access items by index and also access it’s length property. That’s all. What if you want to make a copy of the array? What if you want to push or pop items? Well… you have some work to do… OR …

Or do something smart. Like call the slice method from Array.prototype on the arguments, something like:

//this makes a copy of the arguments and returns a true array
Array.prototype.slice.call(arguments, 0) 

//pushes the value '5' in the arguments
Array.prototype.push(arguments, 5)
//this is not valid: arguments.push(5)

Well, maybe most of you expert JavaScript programmers have thought about this, and this is not a news. But, let’s share from our experience to the more novice/newcomers to JavaScript and show them the beauty of this language!

JavaScript is a great language! It’s expressive! It’s powerful! That’s why we love JavaScript.

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