On Jul 28, 2011, at 1:44 AM, Oskar wrote:
> I have a hard time coming up reasons why this would be better. My
> function that I wanted that checks if two characters are close enough
> to each other is just a very small part of my game. And I could make
> just that function fuctional and my list of benefits would be nil.
> Sure, immutable data structures is great, for example, but in this
> case, I don't see how making the game purely functional would make the
> code better. But I could be wrong of course. It's kind of hard to
> imagine. If enough people say "Yes, do it!" I might try it.
I'd say "yes" if only for the experience of writing a "purely functional" game
(minus the I/O, of course). I wrote a Pong clone in a similar way, though I
don't share that author's dislike for passing the whole world to each "mover"
function. That lets you do neat things like:
(reduce
(fn [world mover]
(merge world (mover world dt)))
[world
move-players
move-ball
collide-player
collide-wall
collide-goal])
where each of the "mover" functions returns an updated partial world hash. One
advantage to this approach is that you can see exactly what changes to the
world each function is making, which is great for testing and debugging. Of
course you can use an atom in much the same way, but to me passing a "world"
argument around my program isn't a big deal.
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