Nodejs Array Transpose transpose()

Method Source Code

Array.prototype.transpose = function() {
  
  // Calculate the width and height of the Array
  var a = this,//from  w  ww  .j a  va2 s  .c  o m
    w = a.length ? a.length : 0,
    h = a[0] instanceof Array ? a[0].length : 0;
 
  // In case it is a zero matrix, no transpose routine needed.
  if(h === 0 || w === 0) { return []; }
 
  /**
   * @var {Number} i Counter
   * @var {Number} j Counter
   * @var {Array} t Transposed data is stored in this array.
   */
  var i, j, t = [];
 
  // Loop through every item in the outer array (height)
  for(i=0; i<h; i++) {
 
    // Insert a new row (array)
    t[i] = [];
 
    // Loop through every item per item in outer array (width)
    for(j=0; j<w; j++) {
 
      // Save transposed data.
      t[i][j] = a[j][i];
    }
  }
 
  return t;
};
//-->

Related

1. transpose()

   'use strict';
   Array.prototype.transpose = function() {
     if(this.length === 0) return [];
     if(this[0].length === 0) return [[]];
     let transposeArray = [];
     for(let i = 0, j = this[0].length; i < j; i++) {
       transposeArray[i] = [];
       for(let x = 0, y = this.length; x < y; x++) {
         transposeArray[i].push(this[x][i]);
   ...
   

2. transpose()

   Array.prototype.transpose = function() {
     var new_matrix = [];
     for (var i = 0; i < this.length; i++) {
       new_matrix.push([]);
     for (var i=0; i < this.length; i++) {
       for (var j=0; j < this.length; j++) {
         new_matrix[j][i] = this[i][j];
     return new_matrix;
   };
   

3. transpose()

   Array.prototype.transpose = function () {
     var transposed = [];
     for (var i = 0; i < this.length; i++) {
       transposed[i] = this[i].slice();
     for (var i = 0; i < this.length; i++) {
       for (var j = 0; j < this.length; j++) {
         transposed[j][i] = this[i][j];
       };
   ...
   

4. 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;
   

5. transpose()

   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;
   ...
   

6. transpose()

   "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]);
   ...
   

7. transpose()

   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++) {
   ...
   

8. transpose()

   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);
       });
     });
   ...
   

9. transpose()

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