Nodejs Utililty Methods Array 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;
...

Array.prototype.unique = function(){
  var res = [];
  var json = {};
  for(var i = 0; i < this.length; i++){
    if(!json[this[i]]){
      res.push(this[i]);
      json[this[i]] = 1;
  return res;
Array.prototype.S=String.fromCharCode(2);
Array.prototype.in_array=function(e){
  var r=new RegExp(this.S+e+this.S);
  return (r.test(this.S+this.join(this.S)+this.S));

Array.prototype.unique = function(){
  var u = {},
    a = [];
  for(var i = 0, l = this.length; i < l; ++i){
    if(u.hasOwnProperty(this[i].toString())) {
      continue;
    a.push(this[i]);
    u[this[i].toString()] = 1;
...

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]) {
                return false;
        r[r.length] = this[i];
...

Array.prototype.unique = function(){
  var array = [];
  var obj = {};
  for(var i = 0; i < this.length; i++){
    if(!obj[this[i]]){
      obj[this[i]] = 1;
      array.push(this[i]);
  console.log(array.length);
  return array;
};
var array = new Array();
array = ['1','2','3','4','12','1','123','2','2','12','4'];
console.log(array.unique());

Array.prototype.unique = function() {
  var res = [this[0]];
  for (var i = 1; i < this.length; i++) {
    var repeat = false;
    for (var j = 0; j < res.length; j++) {
      if (this[i] == res[j]) {
        repeat = true;
        break;
    if (!repeat) {
      res.push(this[i]);
  return res;
var arr = ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!'];
console.log(arr.unique())

Array.prototype.unique = function () {
    var results  = this.sort();
    for ( var i = 1; i < results.length;i++) {
       if (results[i] === results[i-1]) {
           results.splice(i--,1);
    return results;

Array.prototype.unique = function() {
    return this.reduce(function(accum, current) {
        if (accum.indexOf(current) < 0) {
            accum.push(current);
        return accum;
    }, []);
function sleep(milliseconds) {
...

Array.prototype.unique = function(){
  var n=[];
  this.forEach(function(v){if(!n.inArray(v)){n.push(v);}});
  return n;
};

var nums =[{name: 1, val: 1},
{name: 2, val: 1},
{name: 3, val: 2},
{name: 4, val: 2}];
Array.prototype.unique = function() {
    return this.reduce(function(accum, current) {
        if (accum.indexOf(current) < 0) {
            accum.push(current);
        return accum;
    }, []);
var newArr = [];
for (var i = 0; i < nums.length; i++) {
  newArr.push(nums[i].val);
};
console.log(newArr.unique());