Function definition optional arguments

CL-USER(10): (defun board-dimensions (length width

&optional (extra 0))

(* (+ length extra)

(+ width extra)))

BOARD-DIMENSIONS

CL-USER(11): (board-dimensions 10 12 1)

143

CL-USER(12): (board-dimensions 10 12)

120

CL-USER(13):

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