Javascript - Array.compare(array)

// If you need to be able to compare Arrays this is the prototype to do it. Pass an Array you
// want to compare and if they are identical the method will return true. If there's a
// difference it will return false. The match must be identical so '80' is not the same as 80.

Array.prototype.compare = function(testArr) {
    if (this.length != testArr.length) return false;
    for (var i = 0; i < testArr.length; i++) {
        if (this[i].compare) { 
            if (!this[i].compare(testArr[i])) return false;
        }
        if (this[i] !== testArr[i]) return false;
    }
    return true;
}