Nodejs Array Unique unique()

Method Source Code

// Returns an array of all the distinct elements in a given Array

Array.prototype.unique = function() {

    // Prototypes throw TypeErrors when the context or arguments are invalid

    if (Object.prototype.toString.call(this) !== '[object Array]') {
        throw new TypeError("`this` must be Array, not " + typeof this);
    }/* ww  w.  java2  s  .  c o m*/

    var unique = [];

    for (var i = 0, l = this.length; i < l; i++) {
        var element = this[i];

        if (unique.indexOf(element) === -1) {
            unique.push(element);
        }
    }

    return unique;
};

Related

1. unique()

   Array.prototype.unique = function () {
     var arr = this;
     return this.filter(function (el, idx) {
       return arr.lastIndexOf(el) === idx;
     });
   };
   

2. unique()

   Array.prototype.unique = function () {
     var r = [];
     o:for(var i = 0, n = this.length; i < n; i++) {
       for(var x = 0, y = r.length; x < y; x++) {
         if(r[x] == this[i]) {
           continue o;
       r[r.length] = this[i];
   ...
   

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()

   function getDomain(address) {
     return address.substring(address.indexOf('@') + 1);
   function cleanPhoneNo(str) {
     return str.replace(/[^\d]/g, '');
   function escapeRegExp(str) {
     var specials = new RegExp("[.*+?|()\\[\\]{}\\\\]", "g"); 
     return str.replace(specials, "\\$&");
   ...
   

5. unique()

   function SecondGreatLow(arr) {
    arr.sort(function (a,b){
      return a-b;
    });
    arr = arr.unique();
    if (arr.length == 2){
       return arr[1]+ " "+ arr[0];
    } else {
       return arr[1]+ " " + arr[arr.length-2];
   ...
   

6. unique()

   Array.prototype.unique = function(){
     var r = new Array();
     o:for (var i = 0; i < this.length; i++) {
       for (var x = 0; x < r.length; x++) {
         if (r[x]==this[i]) continue o;
       r[r.length] = this[i];
     return r;
   ...
   

7. unique()

   Array.prototype.unique = function() {
     var o = {}, i, l = this.length, r = [];
     for(i=0; i<l;i+=1) o[this[i]] = this[i];
     for(i in o) {
       if (o[i]) {
         r.push(o[i]);
     return r;
   ...
   

8. unique()

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

9. unique()

   Array.prototype.unique = function () {
       var r = new Array();
       o:for(var i = 0, n = this.length; i < n; i++)
         for(var x = 0, y = r.length; x < y; x++)
           if(r[x]==this[i])
             continue o;
   ...