Nodejs Array Unique unique()

Method Source Code

var fs = require('fs');

Array.prototype.unique = function() {
   var res = [],/*from w w  w  . j a va 2  s  .co  m*/
      hash = {};
   for (var i = 0, elem;
      (elem = this[i]) != null; i++) {
      if (!hash[elem]) {
         res.push(elem);
         hash[elem] = true;
      }
   }
   return res;
};
Array.prototype.superUnique = function() {
   var res = [],
      hash = {};
   for (var i = 0; i < this.length - 1; i++) {
      var elem = this[i];
      var compareEle = JSON.parse(this[i]).tel.toString() + JSON.parse(this[i]).email.toString();
      if (!hash[compareEle]) {
         res.push(elem);
         hash[compareEle] = true;
      }
   }
   return res;
};

Related

1. 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;
   function lowestUnique(str) {
     var arr = str.split(" ");
     var length = arr.length;
     var mapObj = {};
     var uniqueArr = arr.unique();
     for (var i = 0; i < length; i++) {
       mapObj[arr[i]] = 1 + (mapObj[arr[i]] || 0);
     var lowestNum = 100000000000;
     for (var n = 0; n < uniqueArr.length; n++) {
       if (mapObj[uniqueArr[n]] == 1) {
         if (lowestNum > uniqueArr[n]) {
           lowestNum = uniqueArr[n];
     if (lowestNum === 100000000000) {
       console.log(0);
     } else {
       arr.filter(function(e, ind, array) {
         if (e == lowestNum) {
           console.log(ind + 1);
       });
   

2. unique()

   Array.prototype.unique = function() {
     var json = {};
     var res = [];
     for(var i = 0;i < this.length;i++) {
       if(!json[this[i]]) {
         res.push(this[i]);
         json[this[i]] = true;
     console.log(json);
     return res;
   var a = [1,2,3,3,2,1,4,4,0,7,7,7,7,7];
   console.log(a.unique());
   

3. unique()

   Array.prototype.unique = function() {
     var output = {};
     for (var key = 0; key < this.length; key++) {
       output[this[key]] = this[key];
     var results = [];
     for (key in output) {
       var value = output[key];
       results.push(value);
   ...
   

4. unique()

   Array.prototype.unique = function(){
       var temp = {};
       for (var i = 0; i < this.length; i++)
           temp[this[i]] = true;
       var r = [];
       for (var k in temp)
           r.push(k);
       return r;
   

5. unique()

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

6. unique()

   Array.prototype.unique = function() {
       var newArr = [],
           origLen = this.length,
           found, x, y;
       for (x = 0; x < origLen; x++) {
           found = undefined;
           for (y = 0; y < newArr.length; y++) {
               if (this[x] === newArr[y]) {
                   found = true;
   ...
   

7. unique()

   Array.prototype.unique = function() {
       return this.reduce(function(accum, current) {
           if (accum.indexOf(current) < 0) {
               accum.push(current);
           return accum;
       }, []);
   };
   function mutation(arr) {
   ...
   

8. 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;
   ...
   

9. unique()

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