Nodejs Utililty Methods Array Convert

Array.prototype.toForty = function () {
  for (var i = 1; i < 41; i++) {
    this.push(i);
  return this;
},

Array.prototype.toForty = function(){
    var start = 2;
    var end = 40;
    for(var i = start; i <= end; i += 2){
        this.push(i);
   return this;
var oneToForty = [].toForty();
...

Array.prototype.toForty  = function() {
  return Array.range(40, 2);
};

Array.prototype.toForty = function(){
  b = [];
  for(i=2; i<=40; i+=2){
    b.push(i);
  return b

Array.prototype.toForty = function() {
  'use strict';
  var arr = [];
  for (var i = 2; i <= 40; i += 2) {
    arr.push(i);
  return arr;
};

Array.prototype.toHash = function(){
  var map = {}
  for(var i = 0;i < this.length; i++)
    map[this[i]] = ''
  return map
};

Array.prototype.toHash = function()
    var r = new Hashtable();
    this.forEach(function (item) { r.put(item, true); });
    return r;

Array.prototype.toHexArray = function() {
    var hex_array = [];
    for (var i=0; i < this.length; i++) {
        var val;
        if (typeof(this[i]) === "string") {
            val = parseInt(this[i], 2).toString(16);
        else if (typeof(this[i]) === "number") {
            val = this[i].toString(16);
...

Array.prototype.toIntArray = function() {
    var int_array = [];
    for (var i=0; i < this.length; i++) {
        var val = parseInt(this[i], 2);
        int_array.push(val);
    return int_array;
};

Array.prototype.toInts = function(){
  return this.map(function(val){
    return parseInt(val, 10);
  });
};