Nodejs Array Unique uniq()

Method Source Code

Array.prototype.uniq = function() {
  let i;/*  w w  w.j a  v a  2 s. c  om*/
  let uniqArr = [];

  for (i = 0; i < this.length; i++) {
    if (!uniqArr.includes(this[i])) {
      uniqArr.push(this[i]);
    }
  }

  return uniqArr;
};

let arr = [1,2,3,3,5,5,5,1];

console.log(arr.uniq());
//======================================================================
Array.prototype.twoSum = function() {
  let i, j;
  let twoSumArr = [];
  for(i = 0; i < this.length - 1; i++) {
    for(j = i + 1; j < this.length; j++) {
      if (this[i] + this[j] === 0) {
        twoSumArr.push([i,j]);
      }
    }
  }
  return twoSumArr;
};

console.log([-1, 0, 2, -2, 1].twoSum());
//======================================================================

Array.prototype.transpose = function () {
  let i, j;
  let transposeArr = [];
  for(i = 0; i < this.length; i++) {
    let row = [];
    for(j = 0; j < this.length; j++) {
      row.push(this[j][i]);
    }
    transposeArr.push(row);
  }
  return transposeArr;
};
let rows = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
  ];
  console.log(rows.transpose());
//======================================================================

Related

1. uniq()

   "use strict";
   Array.prototype.uniq = function () {
     let uniqueArray = [];
     for (let i = 0; i < this.length; i++) {
       if (uniqueArray.indexOf(this[i]) === -1) {
         uniqueArray.push(this[i]);
     return uniqueArray;
   ...
   

2. uniq()

   Array.prototype.uniq = function () {
     var newArray = [];
     for (var i = 0; i < this.length; i++) {
       var el = this[i];
       if (newArray.indexOf(el) === -1) {
         newArray.push(el);
     return newArray;
   ...
   

3. uniq()

   Array.prototype.uniq = function() {
     var dups = {},
         cleanArray = [];
         array = this,
         i = 0,
         len = array.length;
     if(this.constructor !== Array) {
       throw new TypeError ('Can only call this method on an array');
     for(i; i < len; i++) {
       if(!dups[array[i]]) {
         cleanArray.push(array[i]);
         dups[array[i]] = true;
     return cleanArray;
   

4. uniq()

   Array.prototype.uniq = function (){
     let result = [];
     for (let i = 0; i < this.length; i++) {
       if (result.includes(this[i])) {
         continue;
       } else {
         result.push(this[i]);
     return result;
   };
   console.log([1, 2, 1, 3, 3].uniq());
   console.log([1, 2, 3, 4].uniq());
   

5. uniq()

   var bubbleSort = function (array)
     var sorted = false;
     while (!sorted)
       sorted = true;
       for (i = 0; i < array.length - 1; i++)
         if (array[i] > array[i + 1])
   ...
   

6. uniq()

   function uniq(array) {
     let newArray = [];
     for (let i = 0; i < array.length; i++) {
       if (!newArray.includes(array[i])) {
         newArray.push(array[i]);
     return newArray;
   Array.prototype.uniq = function () {
     let newArray = [];
     for (let i = 0; i < this.length; i++) {
       if (!newArray.includes(this[i])) {
         newArray.push(this[i]);
     return newArray;
   };
   Array.prototype.twoSum = function () {
     let positions = [];
     for (let i = 0; i < this.length; i++) {
       for (let j = i + 1; j < this.length; j++) {
         if (this[i] + this[j] === 0) {
           positions.push([i, j]);
     return positions;
   };
   function myTranspose (array) {
     let transposed = [];
     for (let i = 0; i < array.length; i++) {
       let row = [];
       for (let j = 0; j < array.length; j++) {
         row.push(array[j][i]);
       transposed.push(row);
     return transposed;
   console.log(myTranspose([
       [0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]
     ]));
   

7. uniq()

   function uniq(array) {
     const beenSeen = [];
     for (let i = 0; i < array.length; i++) {
       if (!(beenSeen.includes(array[i]))) {
         beenSeen.push(array[i]);
     return beenSeen;
   Array.prototype.uniq = function() {
     const beenSeen = [];
     for (let i = 0; i < this.length; i++) {
       if (!(beenSeen.includes(this[i]))) {
         beenSeen.push(this[i]);
     return beenSeen;
   };
   Array.prototype.two_sum = function() {
     const twoSum = [];
     for (let i = 0; i < this.length - 1 ; i++) {
       for (let j = i + 1; j < this.length; j++) {
         if (this[i] + this[j] === 0) {
           twoSum.push([i , j]);
     return twoSum;
   };
   function myTranspose(matrix) {
     const outLength = matrix[0].length;
     const outWidth = matrix.length;
     const outArray = [];
     for (let i = 0; i < outLength; i++) {
       const row = [];
       for (let j = 0; j < outWidth; j++) {
         row.push(matrix[j][i]);
       outArray.push(row);
     return outArray;
   console.log(myTranspose([
       [0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]
     ]));
   

8. uniq()

   Array.prototype.uniq = function() {
     var uniqArray = [];
     for (var i = 0; i < this.length; i++) {
       if (uniqArray.indexOf(this[i]) === -1) {
         uniqArray.push(this[i]);
     return uniqArray;
   };
   ...
   

9. unique

   Array.prototype.unique =
     function() {
       var a = [];
       var l = this.length;
       for(var i=0; i<l; i++) {
         for(var j=i+1; j<l; j++) {
           if (this[i] === this[j])
             j = ++i;
         a.push(this[i]);
       return a;
     };