Nodejs Array Unique unique()

Here you can find the source of unique()

Method Source Code

// Takes a single-dimensional array and returns a new array with only unique values kept.
Array.prototype.unique = function() {
  var key, output, value, _ref, _results;
  output = {};/*  w  ww.  j a v  a 2 s. co  m*/
  for (key = 0, _ref = this.length; 0 <= _ref ? key < _ref : key > _ref; 0 <= _ref ? key++ : key--) {
    output[this[key]] = this[key];
  }
  _results = [];
  for (key in output) {
    value = output[key];
    _results.push(value);
  }
  return _results;
};

Related

  1. unique()
    Array.prototype.unique = function() {
      return this.reduce(function(prev_val, current_val) {
        if (prev_val.indexOf(current_val) < 0) {
          prev_val.push(current_val);
        return prev_val;
      }, []);
    };
    Array.prototype.times_do = function(callback) {
    ...
    
  2. unique()
    Array.prototype.unique = function() {
        var a = [];
        for (var i = 0, l = this.length; i < l; i++)
            if (a.indexOf(this[i]) === -1)
                a.push(this[i]);
        return a;
    
  3. 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;
    ...
    
  4. unique()
    var numbers = [4,5,4,4,4,5,4,5]
    function unique(arr) {
      var newArr = [];
      for (var i = 0; i < arr.length; i++) {
        if (newArr.indexOf(arr[i]) < 0) {
          newArr.push(arr[i]);
      return newArr;
    ...
    
  5. unique()
    Array.prototype.unique = function(){
       var u = {}, a = [];
       for(var l = 0, i = this.length-1; i >= 0; --i){
          if(u.hasOwnProperty(this[i])) {
             continue;
          a.unshift(this[i]);
          u[this[i]] = 1;
       return a;
    };
    
  6. unique()
    Array.prototype.unique = function () {
        return this.filter(function (value, index, array) {
            return array.indexOf(value) === index;
        });
    };
    
  7. unique()
    'use strict';
    Array.prototype.unique = function() {
      var newArray = [];
      for (var i = 0, l = this.length; i < l; i++) {
        if (newArray.indexOf(this[i]) === -1 && this[i] !== '') {
          newArray.push(this[i]);
      return newArray;
    ...
    
  8. unique()
    Array.prototype.unique = function() {
      var a = [];
      var l = this.length;
      for ( var i = 0; i < l; i++) {
        for ( var j = i + 1; j < l; j++) {
          if (this[i] === this[j])
            j = ++i;
        a.push(this[i]);
    ...
    
  9. unique()
    var fs = require('fs');
    Array.prototype.unique = function() {
      var res = [],
        hash = {};
      for (var i = 0, elem;
        (elem = this[i]) != null; i++) {
        if (!hash[elem]) {
          res.push(elem);
          hash[elem] = true;
    ...