var arrayCmp = function(arr1, arr2) {
  var length = (arr1.length<arr2.length) ? arr1.length : arr2.length;

  for(var i=0; i<length; i++) {
    if(arr1[i] < arr2[i]) { return -1; }
    if(arr1[i] > arr2[i]) { return  1; }
  }

  if(arr1.length < arr2.length) { return -1; }
  if(arr1.length > arr2.length) { return  1; }

  return 0;
};