[removed] hiding prototype methods in for loop?

Question

So lets say I\'ve added some prototype methods to the Array class:

Array.prototype.containsKey = function(obj) {
    for(var key in this)
        if (key =         


        

Answer 1

You can use JavaScript's hasOwnProperty method to achieve this in the loop, like this:

for(var key in arr) {
    if (arr.hasOwnProperty(key)) {
        ...
    }
}

Reference: This YUI blog article.