Nodejs Array Unique uniq()

Method Source Code

Array.prototype.uniq = function (){
  let result = [];/* ww  w  .j  a  v  a  2s. c o m*/
  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());

Related

1. uniq()

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

2. uniq()

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

3. 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;
   ...
   

4. 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;
   ...
   

5. 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;
   

6. 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])
   ...
   

7. uniq()

   Array.prototype.uniq = function() {
     let i;
     let uniqArr = [];
     for (i = 0; i < this.length; i++) {
       if (!uniqArr.includes(this[i])) {
         uniqArr.push(this[i]);
     return uniqArr;
   ...
   

8. 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]
     ]));
   

9. 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]
     ]));