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<article> <h2>Clojure mode</h2> <form><textarea id=“code” name=“code”> ; Conway's Game of Life, based on the work of: ;; Laurent Petit gist.github.com/1200343 ;; Christophe Grand 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)

</textarea></form>

  <script>
    var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
  </script>

  <p><strong>MIME types defined:</strong> <code>text/x-clojure</code>.</p>

</article>