Re: How to implement observer (publish/subscribe) pattern?

[snej]

I think you could also do it in OOP style by defining a Subscriber object with 
a ‘changed’ method, then having the real subscribers subclass that and override 
the method. (Requires ‘pragma multimethods’, I think? I have to admit I haven’t 
tried any real OOP in Nim yet! I’d try it out in a playground but I’m on my 
phone right now...)