Clone an Array in JavaScript

clone-array.js

// extending the Array prototype
Array.prototype.clone = function clone() {
	return this.slice(0);
};
// example
var arr = [4,5];
var copy = arr.slice(0);


// better (since we do not extend the prototype):
function cloneArray(arr) {
  return arr.slice(0);
}
var arr = [4,5];
var copy = cloneArray(arr);