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Created December 10, 2013 15:45
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A simple .new() method to create instances without constructors. This allow us to rewrite the "new" in order to do other things but create objects.
function $new() {
var obj = Object.create(this);
obj.init.apply(obj, arguments);
return obj;
var SimpleMap = {
new: $new,
init: function() {
this._map = Object.create(null);
get: function(key) {
return this._map[key];
set: function(key, value) {
return this._map[key] = value;
var map =;
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porque usar Object.create(null) en vez de {} ?

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Object.create() set's the prototype of the new object to the value you pass to it
{} creates a object which prototype is Object.prototype

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