Nodejs Array Unique unique()

Method Source Code

function stringToBoolean(string) {
  switch(string.toLowerCase()) {
    case "true": case "yes": case "1": return true;
    case "false": case "no": case "0": case null: return false;
    default: return string;
  }//from  w w  w. jav a  2  s. c  o m
}

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;
};

Related

1. 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;
   ...
   

2. unique()

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

3. unique()

   Array.prototype.unique = function() {
     var array = [];
     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;
       array.push(this[i]);
     return(array);
   };
   

4. 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;
   ...
   

5. unique()

   Array.prototype.unique = function() {
       return this.reduce(function(p, c) { 
                       if (p.indexOf(c) < 0) p.push(c);
                       return p;
                   }, []);
   

6. unique()

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

7. unique()

   Array.prototype.unique = function() {
     var arr = [];
     for (var i = 0; i < this.length; i++) {
       if (!arr.contains(this[i])) {
         arr.push(this[i]);
     return arr;
   function lowestUnique(str) {
     var arr = str.split(" ");
     var length = arr.length;
     var mapObj = {};
     var uniqueArr = arr.unique();
     for (var i = 0; i < length; i++) {
       mapObj[arr[i]] = 1 + (mapObj[arr[i]] || 0);
     var lowestNum = 100000000000;
     for (var n = 0; n < uniqueArr.length; n++) {
       if (mapObj[uniqueArr[n]] == 1) {
         if (lowestNum > uniqueArr[n]) {
           lowestNum = uniqueArr[n];
     if (lowestNum === 100000000000) {
       console.log(0);
     } else {
       arr.filter(function(e, ind, array) {
         if (e == lowestNum) {
           console.log(ind + 1);
       });
   

8. 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]] = true;
     console.log(json);
     return res;
   var a = [1,2,3,3,2,1,4,4,0,7,7,7,7,7];
   console.log(a.unique());
   

9. unique()

   Array.prototype.unique = function() {
     var output = {};
     for (var key = 0; key < this.length; key++) {
       output[this[key]] = this[key];
     var results = [];
     for (key in output) {
       var value = output[key];
       results.push(value);
   ...