Nodejs Utililty Methods Array Map

Array.prototype.map = Array.prototype.map || function (f) {
  var result = [];
  this.each(function (element) {
    result.push(f(element, result.length));
  });
  return result;
};

Array.prototype.map = function(fn) {
  let temp = []
  temp.push(fn(this[0], 0, this))
  this.reduce((preValue, value, index, array) => {
    temp.push(fn(value, index, array))
    return value
  })
  return temp

Array.prototype.map = function(fn) 
    var r = [];
    for (var i=0;i<this.length;i++)
        r.push(fn(this[i]));
    return r; 

Array.prototype.map = function(fn, context) {
  if (typeof fn != "function") {
    throw new TypeError(fn + " is not a function");
  if (typeof context === 'undefined') {
    context = this;
  var result = new Array(this.length);
  for (var i = 0, l = this.length; i < l; ++i) {
...

if(!Array.prototype.map) {
Array.prototype.map = function(fn,thisObj)
  var scope = thisObj || window;
  var a = [];
  for(var i=0, j=this.length; i < j; ++i) {
    a.push(fn.call(scope,this[i],i,this));
  return a;
...

Array.prototype.map = function(from, to) {
    var newArray = [];
    for (var i = 0; i < this.length; i++) {
        if (this[i][from] != undefined && this[i][to] != undefined) {
            newArray[this[i][from]] = this[i][to];
    return newArray;
};
...

Array.prototype.map = function(fun ) {
    var len = this.length;
    if (typeof fun != "function")
      throw new TypeError();
    var res = new Array(len);
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
      if (i in this)
...

Array.prototype.map = function(fun ) {
    var len = this.length;
    if (typeof fun != "function")
      throw new TypeError();
    var res = new Array(len);
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
      if (i in this)
...

Array.prototype.map = Array.prototype.map || function(fun ) {
    var len = this.length >>> 0;
    if (typeof fun != "function") {
        throw new TypeError();
    var res = new Array(len);
    var thisp = arguments[1];
    for (var i = 0; i < len; i++) {
        if (i in this) {
...

Array.prototype.map = function(func){
  var result = [];
  forEach(this, function (element) {
    result.push(func(element));
  });
  return result;