Nodejs Array Transpose transpose()

Method Source Code

"use strict";//from  ww w .  ja v  a 2 s.  c o m

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]);
    }
  }

  console.log(columns);
}

console.log([[0, 1, 2], [3, 4, 5], [6, 7, 8]].transpose());

Array.prototype.uniq = function() {
  const arr = this.filter( function( item, index, inputArray ) {
             return inputArray.indexOf(item) == index;
  });
  return arr;
};
console.log([1, 1, 2, 2, 3, 3, 4, 4, 5, 5].uniq());

Array.prototype.twoSum = function () {
  const pairs = [];

  for (let i = 0; i < this.length; i++){
    for (let j = (i + 1); j < this.length; j++){
      if(this[i] + this[j] === 0){
        pairs.push([i , j]);
      }
    }
  }

  return pairs;
};
console.log([-1, 0, 2, -2, 1].twoSum());

Related

1. 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;
   };
   

2. 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];
       };
   ...
   

3. 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;
   

4. 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;
   ...
   

5. 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++) {
   ...
   

6. 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++) {
   ...
   

7. 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);
       });
     });
   ...
   

8. transpose()

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

9. 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++) {
   ...