Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function() {
   var json = {};
   var res = [];//w w w .j  av a  2 s  .  c  o  m
   for(var i = 0;i < this.length;i++) {
      if(!json[this[i]]) {
         res.push(this[i]);
         json[this[i]] = 1;
      }
   }
   return res;
}

var a = [1,2,3,3,2,1,4,4,0,7];
console.log(a.unique());

Related

1. unique()

   Array.prototype.unique = function () {
     var o = new Object();
     var i, e;
     for (i = 0; e = this[i]; i++) {
       o[e] = 1
     };
     var a = new Array();
     for (e in o) {
       a.push (e)
   ...
   

2. unique()

   Array.prototype.unique = function(){
     'use strict';
     this.sort();
     var ret = [this[0]];
     for(var index=0; index < this.length; index++){
       if(this[index] != ret[ret.length - 1]){
         ret.push(this[index]);
     return ret;
   };
   

3. unique()

   Array.prototype.unique = function()
       var n = {},r=[];
       for(var i = 0; i < this.length; i++)
           if (!n[this[i]])
               n[this[i]] = true;
               r.push(this[i]);
   ...
   

4. unique()

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

5. unique()

   Array.prototype.unique = function() {
       var a = this.concat();
       for(var i=0; i<a.length; ++i) {
           for(var j=i+1; j<a.length; ++j) {
               if(a[i] === a[j])
                   a.splice(j--, 1);
       return a;
   ...
   

6. unique()

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

7. unique()

   Array.prototype.unique = function () {
       var exist = {},
           i;
       for (i = 0; i < this.length; i++) {
           if (exist[this[i]]) {
               this.splice(i, 1);
               i -= 1;
           } else {
               exist[this[i]] = true;
   ...
   

8. unique()

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

9. unique()

   Array.prototype.unique = function(){
     var new_array = [];
     var index = 0;
     var value = null;
     for( count=0; count < this.length; count++){
       value = this[count];
       if( new_array.indexOf(value)==-1 ){
         new_array[index++] = value;
     return new_array;
   };