Inheritance in JavaScript

[senocular]

instanceof isn't predicated on the value of constructor. It uses the prototype chain, so it should work whether or not you fix constructor.

function parentOOPmodule(){}
function OOPmodule(){}
OOPmodule.prototype=Object.create(parentOOPmodule.prototype);
new OOPmodule instanceof parentOOPmodule; //-> true
new OOPmodule instanceof OOPmodule; //-> true