Nodejs Array Unique uniq()

Method Source Code

Array.prototype.uniq = function () {
    var flag = false;
    var result = [];
    for(var i=0;i<this.length;i++) {
        if(result.indexOf(this[i]) == -1) {
            if(this[i]==this[i]) {
                result.push(this[i]);//from   www. j a  va2 s .  c  om
            }
            else if(!flag) {
                result.push(this[i]);
                flag = true;
            }
        }
    }
    return result;
}

console.log([false, true, undefined, null, NaN, 0, 1, {}, {}, 'a', 'a', NaN].uniq());

Related

1. uniq()

   Array.prototype.uniq = function () {
     var sorted = this.sort();
     var uniques = [sorted[0]];
     for(var i = 1; i < sorted.length; i++) {
       if(sorted[i] !== sorted[i-1]) {
         uniques.push(sorted[i]);
       };
     };
     return uniques;
   ...
   

2. uniq()

   Array.prototype.uniq = function() {
     var results = [];
     for (var i = 0, len = this.length; i < len; i++) {
       var found = false;
       for (var j = 0, len2 = results.length; j < len2; j++) {
         if (this[i] === results[j]) {
           found = true;
           break;
       if (!found) {
         results.push(this[i]);
     return results;
   };
   Array.prototype.uniq = function() {
     var results = [];
     for (var i = 0, len = this.length; i < len; i++) {
       if (results.indexOf(this[i]) < 0) {
         results.push(this[i]);
     return results;
   };
   Array.prototype.uniq = function(sorted) {
     return this.inject([], function(array, value, index) {
       if (0 == index || (sorted ? array.last() != value : !array.include(value))) {
         array.push(value);
       return array;
     });
   };
   

3. uniq()

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

4. uniq()

   Array.prototype.uniq = function () {
     var results = [];
     for (var i = 0; i < this.length; i++) {
       var includes = false;
       for (var j = 0; j < results.length; j++) {
         if (results[j] === this[i]) {
           includes = true;
       };
   ...
   

5. uniq()

   Array.prototype.uniq = function ()
     var dups = [];
     for (var i = 0; i < this.length; i++)
       var flag = true;
       for (var j = 0; j < dups.length; j++)
         if (this[i] === dups[j])
   ...
   

6. uniq()

   Array.prototype.uniq = function(){
     var uniqArray = [];
     for (var i = 0; i < this.length; i++){
       if (uniqArray.indexOf(this[i]) === -1)
         uniqArray.push(this[i])
     return uniqArray
   ...
   

7. uniq()

   Array.prototype.uniq = function() {  
       var temp = {};
       for(var i=0; i<this.length; i++)  {  
               temp[this[i]] = 1;
       this.length = 0;
       for(var e in temp) {  
           this.push(e);
       this.sort()
       return this;  
   function xmlencode(string) {
       return string.replace(/\&/g,'&'+'amp;').replace(/</g,'&'+'lt;')
           .replace(/>/g,'&'+'gt;').replace(/\'/g,'&'+'apos;').replace(/\"/g,'&'+'quot;');
   

8. uniq()

   Array.prototype.uniq = function () {
     var uniq_arr = [];
     for (var i = 0; i < this.length; i++) {
       var included = false;
       for (var j = 0; j < uniq_arr.length; j++) {
         if (uniq_arr[j] === this[i]) {
           included = true;
           break;
         };
   ...
   

9. uniq()

   Array.prototype.uniq = function() {
     let res = [];
     for(let i=0; i < this.length; i++) {
       let value = this[i];
       if (!res.includes(value)) res.push(value);
     return res;
   };
   console.log([1,2,2,1,1,3].uniq());
   ...