Clojure mode (ns game-of-life "Conway's Game of Life, based on the work of Christophe Grand (http://clj-me.cgrand.net/2011/08/19/conways-game-of-life) and Laurent Petit (https://gist.github.com/1200343).") ;;; Core game of life's algorithm functions (defn neighbors "Given a cell's coordinates `[x y]`, returns the coordinates of its neighbors." [[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 neighbors cells)) :when (or (= n 3) (and (= n 2) (cells cell)))] cell))) ;;; Utility methods for displaying game on a text terminal (defn print-grid "Prints a `grid` of `w` columns and `h` rows, on *out*, representing a step in the game." [grid w h] (doseq [x (range (inc w)) y (range (inc h))] (when (= y 0) (println)) (print (if (grid [x y]) "[X]" " . ")))) (defn print-grids "Prints a sequence of `grids` of `w` columns and `h` rows on *out*, representing several steps." [grids w h] (doseq [grid grids] (print-grid grid w h) (println))) ;;; Launches an example grid (def grid "`grid` represents the initial set of living cells" #{[2 1] [2 2] [2 3]}) (print-grids (take 3 (iterate step grid)) 5 5) MIME types defined: text/x-clojure.