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2

adding custom functions into Array.prototype

rated 0 times [ 9] [ 7] / answers: 1 / hits: 92406 / 15 Years ago, thu, june 4, 2009, 12:00:00

I was working on an AJAX-enabled asp.net application.
I've just added some methods to Array.prototype like

Array.prototype.doSomething = function(){

   ...

}

This solution worked for me, being possible reuse code in a 'pretty' way.

But when I've tested it working with the entire page, I had problems..
We had some custom ajax extenders, and they started to behave as the unexpected: some controls displayed 'undefined' around its content or value.

What could be the cause for that? Am I missing something about modifing the prototype of standart objects?

Note: I'm pretty sure that the error begins when I modify the prototype for Array. It should be only compatible with IE.

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answered 15 Years ago deonkalvinw · Accepted Answer

While the potential for clashing with other bits o' code the override a function on a prototype is still a risk, if you want to do this with modern versions of JavaScript, you can use the Object.defineProperty method, e.g.

// functional sort

Object.defineProperty(Array.prototype, 'sortf', {

    value: function(compare) { return [].concat(this).sort(compare); }

});