Nodejs Array Unique uniq()

Method Source Code

Array.prototype.uniq = function(){
    var ans = [];
    var hasNaN = false;
    for(var i = 0,len = this.length; i < len; i++){
        if(ans.indexOf(this[i]) == -1){
            if(this[i] != this[i]){
                if(!hasNaN){
                    ans.push(this[i]);/*  ww  w. j  ava 2 s .  co m*/
                    hasNaN = true;
                }
            }else{
                ans.push(this[i]);
            }
        }
    }
    return ans;
}

Related

1. uniq()

   Object.defineProperty(Array.prototype, 'uniq', {
       enumerable: false,
       value: function() { return [...new Set(this)] }
   });
   console.log([1,2,3,3,3,2,4].uniq())
   

2. uniq()

   Array.prototype.uniq = function () {
     return [...new Set(this)];
   };
   

3. uniq()

   Array.prototype.uniq = function() {
     return this.filter(function(value, index) {
       return this.indexOf(value) == index;
     }.bind(this));
   };
   

4. uniq()

   Array.prototype.uniq = function(){
     var uniqueness = [];
     for(var i = 0; i < this.length; i++){
       var element = this[i];
       if (this.indexOf(element) === this.lastIndexOf(element) || uniqueness.indexOf(element) === -1){
         uniqueness.push(this[i]);
     return uniqueness;
   ...
   

5. uniq()

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

6. uniq()

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

7. uniq()

   Array.prototype.uniq = function () {
     var uniques = [];
     this.forEach(function(element){
       var match = false;
       uniques.forEach(function(uniqElement){
         if (uniqElement === element){
           match = true;
       });
   ...
   

8. uniq()

   Array.prototype.uniq = function () {
     var arr = [];
     var flag = true;
     this.forEach(function (item) {
       if (item != item) {
         flag && arr.indexOf(item) === -1 ? arr.push(item) : '';
         flag = false;
       } else {
         arr.indexOf(item) === -1 ? arr.push(item) : ''
   ...
   

9. uniq()

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