Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function(){
    var u = {}, a = [];
    for(var i = 0, l = this.length; i < l; ++i){
        if(u.hasOwnProperty(this[i])) {
            continue;//from  w  w w . ja  va  2s  . c  o  m
        }
        a.push(this[i]);
        u[this[i]] = 1;
    }
    return a;
}

Related

1. 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;
   };
   

2. 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]);
   ...
   

3. 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;
   ...
   

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 json = {};
     var res = [];
     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());
   

6. 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;
   ...
   

7. 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;
   

8. 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;
   };
   

9. unique()

   Array.prototype.unique = function () {
       var arrVal = this;
       var uniqueArr = [];
       for (var i = arrVal.length; i--; ) {
           var val = arrVal[i];
           if ($.inArray(val, uniqueArr) === -1) {
               uniqueArr.unshift(val);
       return uniqueArr;