Nodejs Array Remove Duplicate removeDups()

Method Source Code

Array.prototype.removeDups = function(){

    var result = [];

    for(var i = 0; i < this.length; i++){
       if(result.indexOf(this[i]) < 0){
           result.push(this[i]);//w  w  w. j a  va 2  s  .  c o  m
       }
    }

    return result;

}

console.log([1, 1, 2, 3, 2].removeDups());

Array.prototype.twoSum = function(){
    result = [];
    for(var i = 0; i < this.length ; i++){
        for(var j = i + 1; j < this.length; j++){
            if(this[i] + this[j] === 0){
                result.push([i, j]);
            }
        }
    }
    return result;
}

console.log([-1, 0, 2, -2, 1].twoSum());

Array.prototype.myTranspose = function(){

    result = [];
    for(var i = 0; i < this.length; i++){
        row = [];
        for(var j = 0; j < this.length; j++){
           row.push(this[j][i]);
        }
        result.push(row);
    }
    return result;
}

console.log([[1, 2, 3], [4, 5, 6], [7, 8, 9]].myTranspose());

Related

1. removeDuplicateValues()

   Array.prototype.removeDuplicateValues = function () {
       return this.filter(function (elem, pos, self) {
           return self.indexOf(elem) === pos;
       });
   };
   

2. removeDuplicatedValues()

   Array.prototype.removeDuplicatedValues = function (){
       var lArray  = this || [];
       var lLength = lArray.length;
       for (var i = lLength - 1; i > -1; i--){
           if (lArray.indexOf(lArray[i]) != i){
               lArray.splice(i, 1);
       if (lLength != lArray.length){
   ...
   

3. removeDuplicates()

   Array.prototype.removeDuplicates = function() {
       var array = this;
       return array.filter(function(elem, pos) {
           return array.indexOf(elem) == pos;
       })
   };
   

4. removeDuplicates()

   Array.prototype.removeDuplicates = function() {
     var results = [];
     for (var i = 0; i < this.length; i++) {
       var fail = false;
       for (var j = 0; j < results.length; j++) {
         if (isSameArray(results[j], this[i])) {
           fail = true;
           break;
       if (!fail) results.push(this[i]);
     return results;
   var isSameArray = function(a1, a2) {
     if (a1.length != a2.length) return false;
     for (var i = 0; i < a1.length; i++) if (!~a2.indexOf(a1[i])) return false;
     return true;
   

5. removeDups()

   Array.prototype.removeDups = function () {
     var len = this.length, arr = [], obj = {}, i;
     for (i = 0; i < len; ++i) {
       obj[this[i]] = 0;
     for (i in obj) {
       arr.push(i);
     return arr;
   ...
   

6. remove_duplicates()

   Array.prototype.remove_duplicates = function() {
       var seen = [];
       for (var i = this.length; --i >= 0;) {
           var el = this[i];
           if (seen.contains(el)) this.splice(i, 1);
           seen.push(el);
       return this;
   };
   ...
   

7. removeElement(search, func)

   Array.prototype.removeElement = function(search, func){
     var index = this.indexOfElement(search, func);
     if(index != -1) {
       var remove = this.splice(index, 1);
       return remove[0];
     return null;