Nodejs Array Unique uniqueByKey(array, key)

Method Source Code

function getGmtOffset() {
   var d = new Date();
   var gmtOffset = d.getTimezoneOffset() * 60;   // minutes to seconds
   return gmtOffset;
}

function getUnixTime(strDate) {
   var d = new Date(strDate);
   var unixTime = (d.getTime() / 1000);
   return unixTime;
}

Array.prototype.uniqueByKey = function(array, key) {
   // unique = foo.uniqueByKey(bar, "key").sort();
   var r = [];//  ww w . ja v  a2  s  .co  m
   for(var i = 0; i < array.length; i++) {
      if(r.indexOf(array[i][key]) == -1) {
         r.push(array[i][key]);
      }
   }
   return r;
}

Array.prototype.unique = function () {
   // unique = foo.unique().sort();
    var r = [];
    for(var i = 0, n = this.length; i < n; i++) {
        if (this.lastIndexOf(this[i]) == i) r.push(this[i]);
    }
    return r;
}

$.expr[':'].contentIs = function(el, idx, meta) {
    return $(el).text() === meta[3];
};

function isarray(input){
   return typeof(input)=='object'&&(input instanceof Array);
}

Related

1. unique3()

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

2. 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]]);
   ...
   

3. 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());
   

4. 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;
   

5. 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;
   ...
   

6. 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;
   };
   

7. 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;
   ...
   

8. 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);
   

9. 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;
       });
   };