Nodejs Array Transpose transpose()

Method Source Code

/*/*from   ww  w .  java 2 s .c  o  m*/
Transpose means is to interchange rows and columns of a two-dimensional array matrix.

[AT]ij=[A]ji

ie: Formally, the i th row, j th column element of AT is the j th row, i th column element of A:

[[1,2,3],[4,5,6]].transpose() //should return [[1,4],[2,5],[3,6]]

*/

'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]);
    }
  }

  return transposeArray;
};

// [[1,2,3],[4,5,6]].transpose();
// console.log([].transpose());
console.log([[],[],[]].transpose());

Related

1. transpose()

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

2. transpose()

   util = require('util');
   var identity = function(x) {
     return x;
   };
   var pair = function(a, b){
     return [a, b];
   };
   var isArray = function(a) {
     return a && typeof a === 'object' && a.constructor === Array;
   ...
   

3. 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++) {
   ...
   

4. transpose()

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

5. transpose()

   Array.prototype.transpose = function () {
     const transposed = [];
     const rows = this.length;
     const cols = this[0].length;
     for (let c = 0; c < cols; c++) {
       let row = [];
       for (let r = 0; r < rows; r++) {
         row.push(this[r][c]);
       transposed.push(row);
     return transposed;
   };
   const arr1 = [1, 2, 2, 4, 6, 6];
   const arr2 = [1, 0, -1, 2, -2];
   const mat = [[1,2,3], [4,5,6]];
   

6. 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;
   };
   

7. 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];
       };
   ...
   

8. 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;
   

9. 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;
   ...