Nodejs Array Unique unique()

Method Source Code

// remove duplicate values from Array
Array.prototype.unique = function () {
    return this.filter(function (value, index, array) {
        return array.indexOf(value) === index;
    });//from  ww w .jav a 2 s . c  o m
};

Related

1. unique()

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

2. 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;
   ...
   

3. unique()

   var numbers = [4,5,4,4,4,5,4,5]
   function unique(arr) {
     var newArr = [];
     for (var i = 0; i < arr.length; i++) {
       if (newArr.indexOf(arr[i]) < 0) {
         newArr.push(arr[i]);
     return newArr;
   ...
   

4. unique()

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

5. unique()

   Array.prototype.unique = function() {
     var key, output, value, _ref, _results;
     output = {};
     for (key = 0, _ref = this.length; 0 <= _ref ? key < _ref : key > _ref; 0 <= _ref ? key++ : key--) {
       output[this[key]] = this[key];
     _results = [];
     for (key in output) {
       value = output[key];
   ...
   

6. unique()

   'use strict';
   Array.prototype.unique = function() {
     var newArray = [];
     for (var i = 0, l = this.length; i < l; i++) {
       if (newArray.indexOf(this[i]) === -1 && this[i] !== '') {
         newArray.push(this[i]);
     return newArray;
   ...
   

7. unique()

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

8. unique()

   var fs = require('fs');
   Array.prototype.unique = function() {
     var res = [],
       hash = {};
     for (var i = 0, elem;
       (elem = this[i]) != null; i++) {
       if (!hash[elem]) {
         res.push(elem);
         hash[elem] = true;
   ...
   

9. unique()

   Array.prototype.unique = function() {
     var seen = {}
     return this.filter(function(x) {
       if (seen[x])
         return
       seen[x] = true
       return x
     })