+Clojure mode + +; Conway's Game of Life, based on the work of: +;; Laurent Petit https://gist.github.com/1200343 +;; Christophe Grand http://clj-me.cgrand.net/2011/08/19/conways-game-of-life + +(ns ^{:doc "Conway's Game of Life."} + game-of-life) + +;; Core game of life's algorithm functions + +(defn neighbours + "Given a cell's coordinates, returns the coordinates of its neighbours." + [[x y]] + (for [dx [-1 0 1] dy (if (zero? dx) [-1 1] [-1 0 1])] + [(+ dx x) (+ dy y)])) + +(defn step + "Given a set of living cells, computes the new set of living cells." + [cells] + (set (for [[cell n] (frequencies (mapcat neighbours cells)) + :when (or (= n 3) (and (= n 2) (cells cell)))] + cell))) + +;; Utility methods for displaying game on a text terminal + +(defn print-board + "Prints a board on *out*, representing a step in the game." + [board w h] + (doseq [x (range (inc w)) y (range (inc h))] + (if (= y 0) (print "\n")) + (print (if (board [x y]) "[X]" " . ")))) + +(defn display-grids + "Prints a squence of boards on *out*, representing several steps." + [grids w h] + (doseq [board grids] + (print-board board w h) + (print "\n"))) + +;; Launches an example board + +(def + ^{:doc "board represents the initial set of living cells"} + board #{[2 1] [2 2] [2 3]}) + +(display-grids (take 3 (iterate step board)) 5 5) + +;; Let's play with characters +(println \1 \a \# \\ + \" \( \newline + \} \" \space + \tab \return \backspace + \u1000 \uAaAa \u9F9F) + + + + + MIME types defined: text/x-clojure. + +
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