Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function(){
   'use strict';/*from w  ww  .j a va2s.co m*/

   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;
};

Related

1. unique()

   Array.prototype.unique = function() {
      return this.sort().reduce( (a,e) => e === a[a.length-1] ? a : (a.push(e), a), [] )
   

2. 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;
   

3. unique()

   Array.prototype.unique = function (){
     return Array.from(new Set(this));
   let testArray = [1,2,5,4,2,6,1];
   console.log(testArray.unique());
   

4. unique()

   Array.prototype.unique = function() {
     var o = {}, i, l = this.length, r = [];
     for(i=0; i<l;i+=1) o[this[i]] = this[i];
     for(i in o) r.push(o[i]);
     return r;
   };
   

5. 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)
   ...
   

6. 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]);
   ...
   

7. 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;
   ...
   

8. 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;
   ...
   

9. 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());