Unique values in JavaScript Arrays

A snippet I use frequently to remove the duplicates entry in my arrays, it's an extension of the array class.

Array.prototype.unique = function () {
 var r = [];
 o:for(var i = 0, n = this.length; i < n; i++)
 {
 for(var x = 0, y = r.length; x < y; x++)
 {
 if(r[x]===this[i])
 {
 continue o;
 }
 }
 r[r.length] = this[i];
 }
 return r;
};

Use it this way : [1, 2, 3, 4, 1].unique()

It will return : [1, 2, 3, 4]

Happy coding!

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