Function And Object Types

function aa() {};
var bb = new aa();

var dd = new function cc() {};

aa.prototype.rr = 100;
cc.prototype.rr = 100;

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i wrote the code above that makes two functions and two object for
those.

bb(object)<-aa(function),
cc(object)<-dd(function).

i think it's all the same way to make an object for a function.

but if u try to debug,

bb object has rr right after "aa.prototype.rr = 100" statement
but cc deosn't have rr variable.

can anyone explain it why?