[Cuis-dev] Interesting thoughts about Color

[ken.dickey at whidbey.com]

On 2019-04-28 17:57, Phil B wrote:

> Ken,
> 
> I'm not following your thinking here.   What other implementations of 
> things like #darker are you thinking of and how would renaming break 
> encapsulation?
> 
> As an example, let's say we had Form implement #darker which darkened 
> the image and Color where #darker returns a new, darker color.  I'd see 
> that as semantic overloading, not polymorphism.   And in the event we 
> actually wanted the Form implementation to return a new, darkened Form, 
> how would calling it #asDarkerForm break encapsulation?  To me, that's 
> just making it clear that you are not darkening the existing image but 
> rather creating a new one... I still have no idea what's going on 
> inside the object, only what I expect it to do/return.

I tend to think of immutable, functional data structures.  So I don't 
expect 'foo darker' to return a mutable object.

How would 'foo asDarker' help me?

Why bother to go through a lot of working code and change #darker to 
#asDarker to distinguish cases where uses of #darker returns a mutable 
object?

Where is the semantic distinction helpful?

-KenD