Nodejs Utililty Methods Array Flatten

Array.prototype.flatten = function () {
    var thisArr = this;
    var newArr  = [];
    recursive(thisArr);
    function recursive (arr) {
        for (var i = 0; i < arr.length; i++) {
            if (arr[i] instanceof Array) {
                recursive(arr[i]);
            } else {
...

"use strict";
Array.prototype.flatten = function () {
    var result = [];
    function getValues(array) {
        var i;
        for (i = 0; i < array.length; i++) {
            var value = array[i];
            if (Array.isArray(value)) {
                getValues(value);
...

var array;
Array.prototype.flatten = function () {
    'use strict';
    var resultArray = [];
    function getValues(array) {
        var i,
            value;
        for (i = 0; i < array.length; i += 1) {
            value = array[i];
...

Array.prototype.flatten = function() {
    var resultArray = [];
    function getValues(array) {
        var i;
        for (i = 0; i < array.length; i += 1) {
            var value = array[i];
            if (Array.isArray(value)) {
                getValues(value);
            } else {
...

Array.prototype.flatten = function () {
    var arrayResult = [];
    flatten(this);
    function flatten(array) {
        var length = array.length;
        for (var i = 0; i < length; i++) {
            var element = array[i];
            if (Array.isArray(element)) {
                flatten(element);
...

Array.prototype.flatten = function() {
    var flatten = function(items) {
        var flattened = [];
        items.forEach(function(item) {
            if (typeof item === "object") {
                flatten(item).forEach(function (i) {
                    flattened.push(i);
                });
            } else {
...

Array.prototype.flatten = function(){
  var flat_array = [];
  for(var i = 0; i < this.length; i++){
    if (this[i].constructor == Array){
      this[i] = this[i].flatten();
      flat_array = flat_array.concat(this[i]);
    else { flat_array.push(this[i]); }
  return flat_array;

Array.prototype.flatten = function() {
  var results = [];
  for (var i = 0, len = this.length; i < len; i++) {
    if (typeof this[i] == "object" && this[i].constructor === Array) {
      results = results.concat(this[i].flatten());
    } else {
      results.push(this[i]);
  return results;
};
Array.prototype.flatten = function() {
  var results = [];
  for (var i = 0, len = this.length; i < len; i++) {
    results = results.concat(Object.isArray(this[i]) ? this[i].flatten() : [this[i]]);
  return results;
};
Array.prototype.flatten = function() {
  return this.inject([], function(array, value) {
    return array.concat(Object.isArray(value) ?
      value.flatten() : [value]);
  });
};

Array.prototype.flatten = function() {
    var resultArray = [];
    function getValues(array) {
        var i;
        for (i = 0; i < array.length; i += 1) {
            var value = array[i];
            if (Array.isArray(value)) {
                getValues(value);
            } else {
...

Array.prototype.flatten = function() {
  var toString = Object.prototype.toString;
  var arrayTypeStr = '[object Array]';
  var result = [];
  var nodes = this.slice();
  var node;
  if (!this.length) {
    return result;
  node = nodes.pop();
  do {
    if (toString.call(node) === arrayTypeStr) {
      nodes.push.apply(nodes, node);
    } else {
      result.push(node);
  } while (nodes.length && (node = nodes.pop()) !== undefined);
  result.reverse();
  return result;