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Editorial Team
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Asked: 2026-06-03T19:13:26+00:00

Please explain the [[[0]*64 for i in range(7)] for j in range(2)] part and

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Please explain the [[[0]*64 for i in range(7)] for j in range(2)] part and how to write a lisp equivalent.

pieceHashes = [[[0]*64 for i in range(7)] for j in range(2)]
    for color in WHITE, BLACK:
        for piece in PAWN, KNIGHT, BISHOP, ROOK, QUEEN, KING:
            for cord in range(64):
                pieceHashes[color][piece][cord] = randint(0, maxint)
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1 Answer

  1. Editorial Team
    (let ((piece-array (make-array '(2 7 64) :initial-element 0)))
  (dolist (color `(,white ,black))
    (dolist (piece `(,pawn ,knight ,bishop ,rook ,queen ,king))
      (loop for cord below 64
            do (setf (aref piece-array color piece cord)
                     (random maxint))))))
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