# CodeMirror: 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)

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