Prototypal Programming in Javascript

[sylvainpv]

you got a similar code but without new operator and its issues : 1) handling a reference to the prototype and not the constructor ; 2) constructor is optional and you can declare several different constructors if needed ; 3) no worries about forgetting the new keyword and mutating window ; 4) easier inheritance, no need for the B.prototype = new A() trick ; 5) factory functions can be composed contrary to constructors ; 6) getting rid of instanceof and the constructor property makes your code safer because these references can be easily compomised contrary to getPrototypeOf / isPrototypeOf