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24 lines
968 B
Scheme
24 lines
968 B
Scheme
;;; test-common.scm -- common definitions for the Scheme tests
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(define (check exp result)
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(let ((actually (eval exp)))
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(if (not (equal? actually result))
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(begin
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(write-string "test: ") (write exp) (newline)
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(write-string "expect: ") (write result) (newline)
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(write-string "got: ") (write actually) (newline)
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(error "failed!")))))
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;; Return (f (f (f ... (f a) ... ))) with n invocations of f.
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(define (church n f a)
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(if (eqv? n 0)
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a
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(church (- n 1) f (f a))))
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(define (map f l) (if (null? l) '() (cons (f (car l)) (map f (cdr l)))))
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(define (all l) (if (null? l) #t (if (car l) (all (cdr l)) #f)))
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(define (range n) (if (eqv? n 0) '() (append (range (- n 1)) (list n))))
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(define (for-each f l) (if (null? l) #f (begin (f (car l)) (for-each f (cdr l)))))
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(define (reduce f l a) (if (null? l) a (f (car l) (reduce f (cdr l) a))))
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(define (sum l) (reduce + l 0))
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(define (abs x) (if (< x 0) (- x) x))
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