Nodejs Array Unique uniqueCounter()

Method Source Code

/**//from w ww . ja va2s.  c om
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 * User: ferron
 * Date: 1/4/12
 * Time: 5:41 AM
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 */


/**
* The following function counts the amount of unique items in an array
* @params limit - the anount of permutations to execute
*/
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] is found later in the array
         if (this[i] === this[j]) {
            j = i =+ 1;
         }
      }
      counter += 1;
    }
    return counter;
};

Related

1. 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]]);
   ...
   

2. 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());
   

3. 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;
   

4. uniqueArray_unique()

   "use strict";
   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;
   ...
   

5. 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;
   ...
   

6. 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;
   ...
   

7. 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);
   

8. uniqueObjects(props)

   Array.prototype.uniqueObjects = function (props) {
       function compare(a, b) {
           var prop;
           if (props) {
               for (var j = 0; j < props.length; j++) {
                   prop = props[j];
                   if (a[prop] != b[prop]) {
                       return false;
           } else {
               for (prop in a) {
                   if (a[prop] != b[prop]) {
                       return false;
           return true;
       return this.filter(function (item, index, list) {
           for (var i = 0; i < index; i++) {
               if (compare(item, list[i])) {
                   return false;
           return true;
       });
   };
   

9. uniquelize()

   Array.prototype.uniquelize = function() {
     var array = new Array();
     var length = this.length;
     for (var i = 0; i < length; i++) {
       if (!array.inArray(this[i])) {
         array.push(this[i]);
     return array;
   ...