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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) '()) ((> b e) '())
(#t (cons b (rangeinc (+ 1 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 (unit v) v)
(define (aget key alist) (cdr (assoc key alist))) (define (aget key alist) (cdr (assoc key alist)))
(define (aset key val alist) (define (aset key val alist)