Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function() {
  var arr = [];//from w  w w  .ja  v a  2s. c om
  for(var i = 0; i < this.length; i++) {
    if(arr.indexOf(this[i]) === -1) {
      arr.push(this[i]);
    }
  }
  return arr;
};

commonCharacters = function(string1, string2){
  var solution = '';
  var array1 = string1.replace(/ /g,'').split('').unique();
  var array2 = string2.replace(/ /g,'').split('').unique();
  for(var i=0; i<array1.length; i++) {
    if(array2.indexOf(array1[i]) !== -1) solution += array1[i];
  }
  return solution;
};

Related

1. unique()

   Array.prototype.unique = function(){
     'use strict';
     var im = {}, uniq = [];
     for (var i=0;i<this.length;i++){
       var type = (this[i]).constructor.name, 
           val = type + (!/num|str|regex|bool/i.test(type) 
                  ? JSON.stringify(this[i]) 
                  : this[i]);
       if (!(val in im)){uniq.push(this[i]);}
   ...
   

2. unique()

   Array.prototype.unique = function () {
       var r = new Array();
       o:for(var i = 0, n = this.length; i < n; i++)
         for(var x = 0, y = r.length; x < y; x++)
           if(r[x]==this[i])
              continue o;
   ...
   

3. unique()

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

4. unique()

   Array.prototype.unique = function() {
     var arr = [this[0]];
     for (var i = 1; i < this.length; i++) {
       if ( arr.indexOf (this[i]) === -1) {
         arr.push(this[i]);
     return arr;
   var arr = [1, 2, 1, 3, 5, 3, 5, '5'];
   console.log(arr.unique());
   console.time();
   var unique2 = function(arr) {
     var 
       ary = [],
       i = 0,
       key;
     for (; key = arr[i++]; ) {
       if ( ary.indexOf(key) === -1 ) {
         ary.push(key);
     return ary;
   console.log(unique2(arr));
   console.timeEnd();
   

5. unique()

   Array.prototype.unique = function () {
       var r = new Array();
       o:for(var i = 0, n = this.length; i < n; i++)
           for(var x = 0, y = r.length; x < y; x++)
                   if(r[x]==this[i])
                           continue o;
   ...
   

6. unique()

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

7. unique()

   Array.prototype.unique = function () { 
     return this.filter((a, i) => this.indexOf(a) === i) 
   

8. unique()

   Array.prototype.unique = function () {
     var arr = this;
     return this.filter(function (el, idx) {
       return arr.lastIndexOf(el) === idx;
     });
   };
   

9. unique()

   Array.prototype.unique = function () {
     var r = [];
     o:for(var i = 0, n = this.length; i < n; i++) {
       for(var x = 0, y = r.length; x < y; x++) {
         if(r[x] == this[i]) {
           continue o;
       r[r.length] = this[i];
   ...