Nodejs Array Unique uniq()

Method Source Code

Array.prototype.uniq = function() {
  let res = [];/*from  ww  w  . j a v  a2s.c om*/
  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());

function twoSum(arr) {
  let res = [];
  const getIndices = (val, index, array) => {
    for(let i=index+1; i < array.length; i++) {
      if (val + array[i] === 0) res.push([index, i]);
    }
  };
  arr.forEach(getIndices);
  return(res);
}
twoSum([1,2,3,-1,-1,-3]);

Array.prototype.transpose = function() {
  // console.log(this);
  if (this.length === 0 ||
     (this.length === 1 && this[0].length === undefined)) {
    return (this);
  }
  let res = [];
  for(let i=0; i < this[0].length; i++) {
    let row = [];
    for(let j = 0; j < this.length; j++) {
      row.push(this[j][i]);
    }
    res.push(row);
  }
  return (res);
};

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

Related

1. uniq()

   Array.prototype.uniq = function ()
     var dups = [];
     for (var i = 0; i < this.length; i++)
       var flag = true;
       for (var j = 0; j < dups.length; j++)
         if (this[i] === dups[j])
   ...
   

2. uniq()

   Array.prototype.uniq = function () {
       var flag = false;
       var result = [];
       for(var i=0;i<this.length;i++) {
           if(result.indexOf(this[i]) == -1) {
               if(this[i]==this[i]) {
                   result.push(this[i]);
               else if(!flag) {
   ...
   

3. 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
   ...
   

4. uniq()

   Array.prototype.uniq = function() {  
       var temp = {};
       for(var i=0; i<this.length; i++)  {  
               temp[this[i]] = 1;
       this.length = 0;
       for(var e in temp) {  
           this.push(e);
       this.sort()
       return this;  
   function xmlencode(string) {
       return string.replace(/\&/g,'&'+'amp;').replace(/</g,'&'+'lt;')
           .replace(/>/g,'&'+'gt;').replace(/\'/g,'&'+'apos;').replace(/\"/g,'&'+'quot;');
   

5. uniq()

   Array.prototype.uniq = function () {
     var uniq_arr = [];
     for (var i = 0; i < this.length; i++) {
       var included = false;
       for (var j = 0; j < uniq_arr.length; j++) {
         if (uniq_arr[j] === this[i]) {
           included = true;
           break;
         };
   ...
   

6. 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;
   };
   ...
   

7. 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;
   ...
   

8. 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;
   ...
   

9. 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;