Warp wrote:

>   What if you want to change the image and want all the sprites using that
> image to see the change?

In Haskell, you must either manually track down all the sprites and 
update them, or you must explicitly use mutable state.

Notice that this is a *design feature*; it prevents things from suddenly 
changing when you didn't touch them, but only touched something they 
indirectly reference. This behaviour can be unexpected in a large, 
complex system. If you actually _want_ this, you must perform work to 
make it happen. (Or... use mutable state.)

-- 
http://blog.orphi.me.uk/
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