dead simple Class function

Class.js

function Class(o){
  var klass = function(){ return o.init.apply(this, arguments) },
      parent = o.parent,
      prototype = "prototype",
      i;
  if(parent) {
    klass[prototype] = parent[prototype];
    klass[prototype].parent = function(){parent.apply(this, arguments)};
  }
  for(i in o) if(o.hasOwnProperty(i)) klass[prototype][i] = o[i];
  return klass[prototype].constructor = klass;
}

/*
 var Foo = new Class({
   init: function (a) {
     this.name = a
   },
   sayHi: function () {
     return "hey" + this.name
   },
   setName: function (a) {
     this.name = a;
     return this
   }
 });
 
 var Bar = new Class({
   parent : Foo, 
   init : function(a, b){
     this.parent(a);
     this.age = b;
   }, 
   toArray : function(){
     return [this.age, this.name]
   }
 })
 
*/

class.min.js

/* 235 bytes */
function Class(e){var t=function(){return e.init.apply(this,arguments)},n=e.parent,r="prototype",i;n&&(t[r]=n[r],t[r].parent=function(){n.apply(this,arguments)});for(i in e)e.hasOwnProperty(i)&&(t[r][i]=e[i]);return t[r].constructor=t}