On Sun, Aug 2, 2009 at 5:48 AM, James Sofra <james.so...@gmail.com> wrote:
> (defn tile-in-bounds? [[x y] maze]
> (let [h (count maze)]
> (if (and (>= y 0) (>= x 0) (< y h))
> (if (< x (count (maze y)))
> true))))
(defn tile-in-bounds? [[x y] maze]
(and (>= y 0) (>= x 0) (< y (count maze)) (< x (count (maze y)))))
Since "and" short-circuits, it's safe to have "(maze y)" after "(< y (count
maze))".
(defn get-tile [[x y] maze]
> (if (tile-in-bounds? [x y] maze)
> ((maze y) x)))
(defn get-tile [[x y] maze]
(get (get maze y) x))
This has identical results (including nil for out-of-bounds).
(defn update-tile [[x y] maze value]
> (if (tile-in-bounds? [x y] maze)
> (assoc maze y (assoc (maze y) x value))
> maze))
Might simplify this a bit using assoc-in.
> (defn filter-neighbours [f [x y] maze]
> (for [dir (list [0 -1] [1 0] [0 1] [-1 0])
> :when (f (map + [x y] dir) maze)]
> (map + [x y] dir)))
(defn filter-neighbors [f [x y] maze]
(filter #(f % maze)
(map #(map + [x y] %)
(list [0 -1] [1 0] [0 1] [-1 0]))))
Maybe that one's not simpler so much as just different.
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