Function definition keyword arguments

CL-USER(13): (defun board-dimensions (length width

&key (extra-width 0)

(extra-length 0))

(* (+ length extra-length)

(+ width extra-width)))

BOARD-DIMENSIONS

CL-USER(14): (board-dimensions 8 12 :extra-length 1)

108

CL-USER(15):

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