Nodejs Utililty Methods Array Last

Array.prototype.last = function() {
  return this[this.length-1];

Array.prototype.last = function ()
  return this[ (this.length-1) ];
};

Array.prototype.last = function() {
    if (this.isEmpty()) {
        return null;
    return this[this.length - 1];
};

Array.prototype.last = function() {
    if (this.length == 0) return null
    return this.slice(this.length - 1)[0]

Array.prototype.last = function (arr) {
  return this[this.length-1]

Array.prototype.last = function(fn, scope) {
    if (Object.prototype.toString.call(this) !== '[object Array]') {
        throw new TypeError("`this` must be Array, not " + typeof this);
    if (typeof fn === 'undefined') {
        return this[this.length - 1];
    if (typeof fn !== 'function') {
        throw new TypeError("Optional argument[0] must be predicate function if defined");
...

Array.prototype.last = function (func) {
    var length = this.length - 1,
        item = null;
    for (var i = length; i >= 0; i--) {
        if (func(this[i])) {
            item = this[i];
            break;
    return item;

Array.prototype.last = function (n) {
    'use strict';
    return this.slice(this.length - (n || 1), this.length);
};

Array.prototype.last = function(n) {
  if (this.length == 0 || n < 0) return void 0;
  if (n == undefined) return this[this.length - 1];
  if (n == 0) return [];
  return this.rest(this.length - n);
};

Array.prototype.last = function (num) {
   if (num !== undefined) {
      return this.slice(-num);
   return this[this.length - 1];
};