Nodejs Array Unique unique()

Method Source Code

var numbers = [4,5,4,4,4,5,4,5]

// Create a function that returns
// an array of unique numbers

// Here's one way
function unique(arr) {
  var newArr = [];
  for (var i = 0; i < arr.length; i++) {
    //console.log(newArr.indexOf(arr[i]));
    if (newArr.indexOf(arr[i]) < 0) {
      newArr.push(arr[i]);/*from   ww w.  j  av  a2  s .c  o m*/
    }
  }
  return newArr;
}

if (this || that && notThis)


Array.prototype.unique = function () {
  var newArr = [];
  for (var i = 0; i < this.length; i++) {
    //console.log(newArr.indexOf(arr[i]));
    if (newArr.indexOf(this[i]) < 0) {
      newArr.push(this[i]);
    }
  }
  return newArr;
}


var unique = function(arr) {
  return arr.filter(function(x, i) {
    return arr.indexOf(x) === i
  })
}

Related

1. unique()

   Array.prototype.unique = function(){
       var array = [];
       for(var i = 0; i < this.length; i++) {
           if(!array.contains(this[i])) {
               array.push(this[i]);
       return array.compact();
   };
   ...
   

2. unique()

   Array.prototype.unique = function() {
     var uniques = [];
     this.forEach(function(value) {
       if (uniques.indexOf(value) == -1)
         uniques.push(value);
     });
     return uniques;
   };
   

3. 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) {
   ...
   

4. 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;
   

5. 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;
   ...
   

6. 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;
   };
   

7. unique()

   Array.prototype.unique = function() {
     var key, output, value, _ref, _results;
     output = {};
     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];
   ...
   

8. unique()

   Array.prototype.unique = function () {
       return this.filter(function (value, index, array) {
           return array.indexOf(value) === index;
       });
   };
   

9. 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;
   ...