Nodejs Utililty Methods Array Same

Array.prototype.same = function() {
    for(var i = 1; i < this.length; i++) {
        if(this[i] !== this[0])
            return false;
    return true;

Array.prototype.same = function(comparisons, unordered) {
    if (Object.prototype.toString.call(this) !== '[object Array]') {
        throw new TypeError("`this` must be Array, not " + typeof this);
    var arglen = arguments.length;
    if (arglen < 1) {
        throw new TypeError("`arguments` must have at least one comparison `Array`");
    var firstarg = arguments[0];
...

Array.prototype.same = function(obj) { 
    var i = this.length;
    while (i--) {
        if (obj.contains(this[i])) {
    return false;
};

Array.prototype.sameElementCount = function(arr) {
  var result = [], count = null;
  arr.sort();
  for (var i = 0; i < arr.length;) {
    count = 1;
    for (var j = i + 1; j < arr.length; j++) {
      if (arr[i] == arr[j]) {
        count++;
    result.push([ arr[i], count ]);
    i += count;
  return result;
};

function findMissing(arr1, arr2){
  if((arr1.length) && (arr2.length) === 0){
    return 0;
  if(arr1.same_values(arr2)){
    return 0;
  for(num = 0; num < arr2.length; num++){
    if(isInArray(arr2[num], arr1) !== true) return arr2[num];
...