github.com/elliott5/community@v0.14.1-0.20160709191136-823126fb026a/app/public/codemirror/mode/clojure/index.html (about)

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    25  <article>
    26  <h2>Clojure mode</h2>
    27  <form><textarea id="code" name="code">
    28  ; Conway's Game of Life, based on the work of:
    29  ;; Laurent Petit https://gist.github.com/1200343
    30  ;; Christophe Grand http://clj-me.cgrand.net/2011/08/19/conways-game-of-life
    31  
    32  (ns ^{:doc "Conway's Game of Life."}
    33   game-of-life)
    34  
    35  ;; Core game of life's algorithm functions
    36  
    37  (defn neighbours
    38    "Given a cell's coordinates, returns the coordinates of its neighbours."
    39    [[x y]]
    40    (for [dx [-1 0 1] dy (if (zero? dx) [-1 1] [-1 0 1])]
    41      [(+ dx x) (+ dy y)]))
    42  
    43  (defn step
    44    "Given a set of living cells, computes the new set of living cells."
    45    [cells]
    46    (set (for [[cell n] (frequencies (mapcat neighbours cells))
    47               :when (or (= n 3) (and (= n 2) (cells cell)))]
    48           cell)))
    49  
    50  ;; Utility methods for displaying game on a text terminal
    51  
    52  (defn print-board
    53    "Prints a board on *out*, representing a step in the game."
    54    [board w h]
    55    (doseq [x (range (inc w)) y (range (inc h))]
    56      (if (= y 0) (print "\n"))
    57      (print (if (board [x y]) "[X]" " . "))))
    58  
    59  (defn display-grids
    60    "Prints a squence of boards on *out*, representing several steps."
    61    [grids w h]
    62    (doseq [board grids]
    63      (print-board board w h)
    64      (print "\n")))
    65  
    66  ;; Launches an example board
    67  
    68  (def
    69    ^{:doc "board represents the initial set of living cells"}
    70     board #{[2 1] [2 2] [2 3]})
    71  
    72  (display-grids (take 3 (iterate step board)) 5 5)
    73  
    74  ;; Let's play with characters
    75  (println \1 \a \# \\
    76           \" \( \newline
    77           \} \" \space
    78           \tab \return \backspace
    79           \u1000 \uAaAa \u9F9F)
    80  
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    85  
    86      <p><strong>MIME types defined:</strong> <code>text/x-clojure</code>.</p>
    87  
    88    </article>