Nodejs Utililty Methods Array Transpose

Array.prototype.transpose = function () {
  var result = []
  for (var row = 0; row < this.length; row++) {
    for (var col = 0; col < this[0].length; col++) {
      if (!result[col]) {
        result[col] = [this[row][col]]
      } else {
        result[col].push(this[row][col])
  return result;

Array.prototype.transpose = function() {
  for(let i = 0; i < this.length; i++){
    for(let j = 0; j < i; j++){
      let temp = this[i][j];
      this[i][j] = this[j][i];
      this[j][i] = temp;
  return this;
...

Array.prototype.transpose = function() {
  var a = this,
    w = a.length ? a.length : 0,
    h = a[0] instanceof Array ? a[0].length : 0;
  if(h === 0 || w === 0) { return []; }
  var i, j, t = [];
  for(i=0; i<h; i++) {
    t[i] = [];
    for(j=0; j<w; j++) {
...

"use strict";
Array.prototype.transpose = function (){
  const columns = [];
  for( let i = 0; i < this[0].length; i++){
    columns.push([]);
  for( let i = 0; i < this.length; i++){
    for(let j = 0; j < this.length; j++){
      columns[j].push(this[i][j]);
...

Array.prototype.transpose = function() {
  var a = this,
    w = a.length ? a.length : 0,
    h = a[0] instanceof Array ? a[0].length : 0;
  if(h === 0 || w === 0) { return []; }
  var i, j, t = [];
  for(i=0; i<h; i++) {
    t[i] = [];
    for(j=0; j<w; j++) {
...

Array.prototype.transpose = function (){
  const cols = this[0].length;
  const rows = this.length;
  let result = Array(rows).fill().map(() => Array());
  this.forEach(function (row){
    row.forEach(function (num, index){
      result[index].push(num);
    });
  });
...

Array.prototype.transpose = function() {
  var result = [];
  if (!(this instanceof Array))
    return result;
  if (this.length == 0)
    return result;
...

Array.prototype.transpose = function() {
  var a = this,
      w = a.length ? a.length : 0,
    h = a[0] instanceof Array ? a[0].length : 0;
  if(h === 0 || w === 0) { return []; }
  var i, j, t = [];
  for(i=0; i<h; i++) {
    t[i] = [];
    for(j=0; j<w; j++) {
...