Nodejs Array Unique unique()

Here you can find the source of 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]);
    ...