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<article>
<h2>Clojure mode</h2>
<form><textarea id="code" name="code">
(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."