61 lines
1010 B
Racket
61 lines
1010 B
Racket
#lang planet dyoo/whalesong/base
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(apply + 2 3 4 5 '())
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(apply + 2 3 4 '(5))
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(apply + 2 3 '(4 5))
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(apply + 2 '(3 4 5))
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(apply + '(2 3 4 5))
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(apply * 2 3 4 5 '())
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(apply * 2 3 4 '(5))
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(apply * 2 3 '(4 5))
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(apply * 2 '(3 4 5))
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(apply * '(2 3 4 5))
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(apply (lambda args args) 2 3 4 5 '())
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(apply (lambda args args) 2 3 4 '(5))
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(apply (lambda args args) 2 3 '(4 5))
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(apply (lambda args args) 2 '(3 4 5))
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(apply (lambda args args) '(2 3 4 5))
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(apply (lambda (a b c) (+ a (* b c))) 2 3 '(4))
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(add1 (apply (lambda (a b c) (+ a (* b c))) 2 3 '(4)))
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(= (apply (lambda (a b c) (+ a (* b c))) 2 3 '(4))
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0)
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(apply list 3 4 '(5))
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(define (square x)
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(* x x))
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(apply square '(7))
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"squaring"
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(define (square2 x)
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(apply * (list x x)))
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(apply square2 '(7))
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(apply square2 8 '())
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"now factorial"
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(define (f x)
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(cond
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[(apply = `(,x 0))
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1]
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[else
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(apply * `(,x ,(apply f (apply sub1 (apply list x '())) '())))]))
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(f 0)
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(apply f 1 '())
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(f 2)
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(apply f '(3))
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(f 4)
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(f 5)
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(+ (apply f 4 '()) (f 5))
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