Nodejs Array Transpose transpose()

Method Source Code

// Write a function on the Array prototype that will transpose a 2-D nested array matrix.
Array.prototype.transpose = function () {
  var columns = [];
  for (var i = 0; i < this[0].length; i++) {
    columns.push([]);/* w w w  .  ja  v a2 s.c  o  m*/
  }

  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;
};

Related

1. transpose()

   Array.prototype.transpose = function() {
     var newArr = []
     for (var i = 0; i <= 2; i++) {
       newArr.push([]);
       for (var j = 0; j <= 2; j ++) {
         var originalElement = this[i][j];
         newArr[i].push(this[j][i]);
     return newArr;
   };
   console.log([[1, 2, 3], [4, 5, 6], [7, 8, 9]].transpose())
   

2. transpose()

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

3. 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;
   ...
   

4. 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++) {
   ...
   

5. 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;
   };
   

6. 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]];