In Javascript, can every function be considered a constructor of a class? [duplicate]

Question

I don't see any syntactic difference between an ordinary function, and one which behaves like a constructor for a class. So are they the same?

Does this mean that every single function we define has a property named 'prototype' by default?

Answer 1

Yes, every function has a property named prototype by default. The "construction" functionality is provided by the [[Construct]] internal property(invoked by new F()), which is set for every created function(see http://es5.github.io/#x13.2 - creating function objects, p18)