Nodejs Utililty Methods Array Unique

Array.prototype.unique=function(a){
  return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0
});

Array.prototype.unique = function(a) {
    return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0
});

x = ''
Array.prototype.unique=function(a){
  return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0
});
function getCombi(vect,res,n,r){
   if(n == 0){
      x = x + res +":";
   }else{
      for(var i = 0; i < r; i++){
...

Array.prototype.unique = function(a) {
    return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0
});

Array.prototype.unique = function(b) {
    var a = [], i, l = this.length;
    for (i = 0; i < l; i++) {
        if (a.indexOf(this[i], 0, b) < 0) {
            a.push(this[i]);
    return a;
};
...

Array.prototype.unique = function(b) {
  var a = [], i, l = this.length;
  for (i = 0; i < l; i++) {
    if (a.indexOf(this[i], 0, b) < 0) {
      a.push(this[i]);
  return a;
};
...

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

Array.prototype.unique = function(data) {
  data.sort();
  var re = [ data[0] ];
  var length = data.length;
  for (var i = 1; i < length; i++) {
    if (data[i] !== re[re.length - 1]) {
      re.push(data[i]);
  return re;
};

(
  Array.prototype.unique = function (fun, map) {
    fun = fun || (function(c) { return c; });
    var arrayUnique = [this[0]], 
    arrayUniqueAtt = [fun(this[0])];
    this.forEach(function(el){
      if (arrayUniqueAtt.indexOf(fun(el)) === -1) {
        arrayUniqueAtt.push(fun(el));
        arrayUnique.push(el);
...

Array.prototype.unique = function(k) {
    var self = this;
    var result = [];
    var sublen = 0;
    for (var i = 0, l = self.length; i < l; i++) {
        var v = self[i];
        if (!k) {
            if (result.indexOf(v) === -1) {
                result.push(v);
...