Nodejs Array Transpose transpose()

Method Source Code

Array.prototype.transpose = function() {
  var newArr = []
  for (var i = 0; i <= 2; i++) {
    newArr.push([]);/*w ww.j  a  v  a 2  s.c  o  m*/
    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())

Related

1. 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;
   ...
   

2. 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;
   };
   

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++) {
   ...