CLTL2中关于Lambda-EXpress参数关键字的一些例子

((lambda (a b) (+ a (* b 3))) 4 5) => 19
((lambda (a &optional (b 2)) (+ a (* b 3))) 4 5) => 19
((lambda (a &optional (b 2)) (+ a (* b 3))) 4) => 10
((lambda (&optional (a 2 b) (c 3 d) &rest x) (list a b c d x)))
=> (2 nil 3 nil nil)
((lambda (&optional (a 2 b) (c 3 d) &rest x) (list a b c d x))
6)
=> (6 t 3 nil nil)
((lambda (&optional (a 2 b) (c 3 d) &rest x) (list a b c d x))
6 3)
=> (6 t 3 t nil)
((lambda (&optional (a 2 b) (c 3 d) &rest x) (list a b c d x))
6 3 8)
=> (6 t 3 t (8))
((lambda (&optional (a 2 b) (c 3 d) &rest x) (list a b c d x))
6 3 8 9 10 11)
=> (6 t 3 t (8 9 10 11))

((lambda (a b &key c d) (list a b c d)) 1 2)
=> (1 2 nil nil)
((lambda (a b &key c d) (list a b c d)) 1 2 :c 6)
=> (1 2 6 nil)
((lambda (a b &key c d) (list a b c d)) 1 2 :d 8)
=> (1 2 nil 8)
((lambda (a b &key c d) (list a b c d)) 1 2 :c 6 :d 8)
=> (1 2 6 8)
((lambda (a b &key c d) (list a b c d)) 1 2 :d 8 :c 6)
=> (1 2 6 8)
((lambda (a b &key c d) (list a b c d)) :a 1 :d 8 :c 6)
=> (:a 1 6 8)
((lambda (a b &key c d) (list a b c d)) :a :b :c :d)
=> (:a :b :d nil)

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
1)   => (1 3 nil 1 ())

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
1 2)   => (1 2 nil 1 ())

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
:c 7)   => (:c 7 nil :c ())

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
1 6 :c 7)   => (1 6 7 1 (:c 7))

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
1 6 :d 8)   => (1 6 nil 8 (:d 8))

((lambda (a &optional (b 3) &rest x &key c (d a))
(list a b c d x))
1 6 :d 8 :c 9 :d 10)   => (1 6 9 8 (:d 8 :c 9 :d 10))