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add a beginning fx

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Quentin 2020-07-04 15:13:54 +02:00
parent 4a4d706798
commit 2df10ebf9e
1 changed files with 12 additions and 1 deletions
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13
data-structures/lists.scm
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@ -10,7 +10,18 @@
((> b e) '())
(#t (cons b (rangeinc (+ 1 b) e)))))
(define (less-than l n) (cond ((null? l) #t) ((<= n 0) #f) (#t (less-than (cdr l) (- n 1)))))
(define (less-than l n)
(cond
((null? l) #t)
((<= n 0) #f)
(#t (less-than (cdr l) (- n 1)))))
(define (beginning l n)
(cond
((null? l) '())
((<= n 0) '())
(#t (cons (car l) (beginning (cdr l) (- n 1))))))
(define (unit v) v)
(define (aget key alist) (cdr (assoc key alist)))
(define (aset key val alist)