Nodejs Array Unique uniqueArray_unique()

Method Source Code

"use strict";//w w w . ja  v  a2  s  .  c o m

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

Related

1. unique2(getKey = val => val)

   Array.prototype.unique2 = function (getKey = val => val) {
     const n = {};
     const r = [];
     for (let i = 0; i < this.length; i += 1) {
       const key = getKey(this[i]);
       if (!n[key]) {
         n[key] = true;
         r.push(this[i]);
     return r;
   };
   

2. unique3()

   Array.prototype.unique3 = function () {
     return this.filter(function (s, i, a) {
       return i===a.lastIndexOf(s);
     })
   };
   

3. unique3()

   Array.prototype.unique3 = function(){
    var res = [];
    var json = {};
    var dejson = {};
    var length = 0;
    for(var i = 0; i < this.length; i++){
     if(!json[this[i].name]){
      dejson[this[i]] = this[i];
      console.log(dejson[this[i]]);
   ...
   

4. unique3()

   Array.prototype.unique3 = function(){
     var res = [1,2,3,4,1,2,3,4];
     var json = {};
     for(var i = 0; i < this.length; i++){
         if(!json[this[i]]) {
           res.push(this[i]);
           json[this[i]] = true;
     return res;
   console.log(unique3());
   

5. unique5()

   Array.prototype.unique5 = function() {
       var res = [], hash = {};
       for(var i=0, elem; (elem = this[i]) != null; i++)  {
           if (!hash[elem])
               res.push(elem);
               hash[elem] = true;
       return res;
   

6. uniqueByKey(array, key)

   function getGmtOffset() {
     var d = new Date();
     var gmtOffset = d.getTimezoneOffset() * 60;  
     return gmtOffset;
   function getUnixTime(strDate) {
     var d = new Date(strDate);
     var unixTime = (d.getTime() / 1000);
     return unixTime;
   ...
   

7. uniqueCounter()

   Array.prototype.uniqueCounter = function () {
       "use strict";
     var counter = 0, l = this.length, i, j;
       for (i = 0; i < l; i += 1) {
       for (j = i + 1; j < l; j += 1) {
         if (this[i] === this[j]) {
           j = i =+ 1;
       counter += 1;
       return counter;
   };
   

8. uniqueDates()

   Array.prototype.uniqueDates = function() {
     var u = [];
     for (k=0; k<this.length; k++) {
       var currentDate = new Date(this[k].annum);
       if (u.map(Number).indexOf(+currentDate) < 0) {
         u.push(currentDate);
     return u;
   ...
   

9. uniqueNonEmpty()

   Array.prototype.uniqueNonEmpty = function () {
     var noempties = true;
     var hash = {};
     for (var i=0 ; i<this.length ; i++) {
       if (!this[i] || this[i]=="") {
         noempties = false;
       } else {
         hash[this[i]] = "1";
     var hashlength=0;
     for (i in hash) {hashlength++};
     return (this.length===hashlength && noempties);