Nodejs Utililty Methods Array to String Convert

Array.prototype.toString = function ()
    return '[' + this.join(',') + ']';

Array.prototype.toString = function(){
  return "["+this.join(", ")+"]";

Array.prototype.toString = function () {
  var add = '['
  this.map(function(elm) {
    return add + '[';
  })

Array.prototype.toString = function () {
  var  str = "["
  for(var i = 0; i < this.length; i++) {
    if(typeof this[i] === "string") {
      str += "'" + this[i] + "'";
    } else {
      str += this[i].toString();
    if(i < this[i].length) {
...

Array.prototype.toString = function () {
  var  str = [];
  for (var i = 0; i < this.length; i++) {
    if (Array.isArray(this[i])) {
      str.push(this[i].toString());
    }else if(typeof this[i] == 'string') {
      str.push("'" + this[i] + "'")
    else {
...

Array.prototype.toString = function () {
  return '(' + this.map(function(item) { return ''+item; }).join(' ') + ')';
};

Array.prototype.toString = function (delim) {
    var ret = "";
    var i;
    for (i = 0; i < this.length; i++) {
        if (i > 0) {
            ret = ret.concat(delim);
        ret = ret.concat(this[i]);
    return ret;

Array.prototype.toString = function (trenner) {
    var str = "";
    if (typeof(trenner) == "undefined")
        trenner = ",";
    for (var i=0;i<this.length;i++)
        str += this[i];
...