Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function () {
  var arr = this;
  return this.filter(function (el, idx) {
    return arr.lastIndexOf(el) === idx;
  });//from   ww  w  .jav  a 2s. c  om
};

Related

1. unique()

   Array.prototype.unique = function() {
     var arr = [this[0]];
     for (var i = 1; i < this.length; i++) {
       if ( arr.indexOf (this[i]) === -1) {
         arr.push(this[i]);
     return arr;
   var arr = [1, 2, 1, 3, 5, 3, 5, '5'];
   console.log(arr.unique());
   console.time();
   var unique2 = function(arr) {
     var 
       ary = [],
       i = 0,
       key;
     for (; key = arr[i++]; ) {
       if ( ary.indexOf(key) === -1 ) {
         ary.push(key);
     return ary;
   console.log(unique2(arr));
   console.timeEnd();
   

2. 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;
   ...
   

3. unique()

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

4. 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;
   

5. unique()

   Array.prototype.unique = function () { 
     return this.filter((a, i) => this.indexOf(a) === i) 
   

6. unique()

   Array.prototype.unique = function () {
     var r = [];
     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;
       r[r.length] = 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()

   function getDomain(address) {
     return address.substring(address.indexOf('@') + 1);
   function cleanPhoneNo(str) {
     return str.replace(/[^\d]/g, '');
   function escapeRegExp(str) {
     var specials = new RegExp("[.*+?|()\\[\\]{}\\\\]", "g"); 
     return str.replace(specials, "\\$&");
   ...
   

9. unique()

   function SecondGreatLow(arr) {
    arr.sort(function (a,b){
      return a-b;
    });
    arr = arr.unique();
    if (arr.length == 2){
       return arr[1]+ " "+ arr[0];
    } else {
       return arr[1]+ " " + arr[arr.length-2];
   ...