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34 lines
593 B
Plaintext
34 lines
593 B
Plaintext
-- board piece
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type P = X | O | E
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type Board = Board P P P P P P P P P
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use Board Board
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use P O X E
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use Optional Some None
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orElse a b =
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match a with
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None -> b
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a -> a
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b = (Board X O X
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O X X
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O E X)
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isWin board =
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same : P -> P -> P -> Optional P
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same a b c = if (a == b) && (a == c) && not (a == E)
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then Some a
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else None
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match board with
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-- vertical top/center/bottom
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-- horizontal left/center/right
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-- diagonal rising/falling
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Board a b c
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d e f
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g h i -> (same a b c)
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> isWin b
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-- Some 3
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