Javascript Array fastReverse()

Array.prototype.fastReverse = function() {
 var originalArray = this;
 var left = null;
 var right = null;
 var length = originalArray.length;
 var array = [];//from  w ww .  ja  va  2 s.co m
 
 for (left = 0, right = length - 1; left < right; left += 1, right -= 1) {
     var temporary = originalArray[left];
     array[left] = originalArray[right];
     array[right] = temporary;
 }
 return array;
};