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;
...

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, "\\$&");
...

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];
...

Array.prototype.unique = function() {
    if (Object.prototype.toString.call(this) !== '[object Array]') {
        throw new TypeError("`this` must be Array, not " + typeof this);
    var unique = [];
    for (var i = 0, l = this.length; i < l; i++) {
        var element = this[i];
        if (unique.indexOf(element) === -1) {
            unique.push(element);
...

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;
...

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;
...

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

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;
...

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;
};

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;
...