swapping two values of a array

here i found a quite interesting method which is really useful when you need to swap two values in a array
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var myArray:Array=["flash","flex","html","dhtml","javascript"];
Array.prototype.swap = function(fromIndex:int, toIndex:int):void {
    var temp:* = this[toIndex];
    this[toIndex] = this[fromIndex];
    this[fromIndex] = temp;
   }
   ;

//swaping first and second index of a array

myArray.swap(0,1);

for (var i :Number=0; i<myArray.length; i++) {
trace(myArray[i]);
}