> However, (I’m guessing) using world or w makes it clear that the functions > are meant to be used with big-bang.
This is on the right track. You are programming using the universe API. This API manipulates what changes in a game which it calls a world. What a world actually is depends on the game/application you are programming. The universe programmer can define a world as they see fit. Universe provides the mechanisms needed "behind the scenes" to manipulate worlds. The programmer must provide a world definition and handlers (used by universe) to manipulate world instances. I hope this helps. Marco On Mon, Jun 30, 2014 at 12:12 PM, Alexander D. Knauth <alexan...@knauth.org> wrote: > In this program, a world is just an interval. > > All of those w s could be replaced with ivl s, because a world is an > interval, and the value of the parameter will always be an interval. > > However, (I’m guessing) using world or w makes it clear that the functions > are meant to be used with big-bang. > > They could’ve also named the struct world instead of interval, but > interval is a better name because its a lot more descriptive of what it > represents. > > On Jun 30, 2014, at 11:43 AM, Steve Graham <jsgraha...@yahoo.com> wrote: > > In Guess My Number I see the following definitions: > > (define (smaller w) > (interval (interval-small w) > (max (interval-small w) (sub1 (guess w))))) > (define (bigger w) > (interval (min (interval-big w) (add1 (guess w))) > (interval-big w))) > (define (guess w) > (quotient (+ (interval-small w) (interval-big w)) 2)) > (define (render w) > (overlay (text (number->string (guess w)) SIZE COLOR) MT-SC)) > (define (render-last-scene w) > (overlay (text "End" SIZE COLOR) MT-SC)) > (define (single? w) > (= (interval-small w) (interval-big w))) > > Why is w (which is world?) included as a parameter? For instance in > guess, it seems the only thing needed to calculate it is access to the > values of interval. > > > Steve > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > > -- Cheers, Marco Have a´¨) ¸.·´¸.·*´¨) ¸.·*¨) (¸.·´ (¸.·´ * wonderful day! :)
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