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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Self-describing-numbers/Racket/self-describing-numbers.rkt Normal file
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#lang racket
(define (get-digits number (lst null))
(if (zero? number)
lst
(get-digits (quotient number 10) (cons (remainder number 10) lst))))
(define (self-describing? number)
(if (= number 0) #f
(let ((digits (get-digits number)))
(for/fold ((bool #t))
((i (in-range (length digits))))
(and bool
(= (count (lambda (x) (= x i)) digits)
(list-ref digits i)))))))