Nodejs Array Unique unique()

Method Source Code

Array.prototype.unique = function(){
   var res = [];/*from  w  w  w .j a  v a2s  . com*/
   var json = {};
   for(var i = 0; i < this.length; i++){
      if(!json[this[i]]){
         res.push(this[i]);
         json[this[i]] = 1;
      }
   }
   return res;
}
Array.prototype.S=String.fromCharCode(2);
Array.prototype.in_array=function(e){
   var r=new RegExp(this.S+e+this.S);
   return (r.test(this.S+this.join(this.S)+this.S));
}

Related

1. unique()

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

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()

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

4. 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; 
   

5. 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;
   ...
   

6. unique()

   Array.prototype.unique = function(){
     var u = {},
       a = [];
     for(var i = 0, l = this.length; i < l; ++i){
       if(u.hasOwnProperty(this[i].toString())) {
         continue;
       a.push(this[i]);
       u[this[i].toString()] = 1;
   ...
   

7. 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]) {
                   return false;
           r[r.length] = this[i];
   ...
   

8. unique()

   Array.prototype.unique = function(){
     var array = [];
     var obj = {};
     for(var i = 0; i < this.length; i++){
       if(!obj[this[i]]){
         obj[this[i]] = 1;
         array.push(this[i]);
     console.log(array.length);
     return array;
   };
   var array = new Array();
   array = ['1','2','3','4','12','1','123','2','2','12','4'];
   console.log(array.unique());
   

9. unique()

   Array.prototype.unique = function() {
     var res = [this[0]];
     for (var i = 1; i < this.length; i++) {
       var repeat = false;
       for (var j = 0; j < res.length; j++) {
         if (this[i] == res[j]) {
           repeat = true;
           break;
       if (!repeat) {
         res.push(this[i]);
     return res;
   var arr = ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!'];
   console.log(arr.unique())