Re: Scheme question: convert a range

[Thomas Morley]

2015-11-15 19:53 GMT+01:00 Simon Albrecht <address@hidden>:
> Hello,
>
> The subject certainly seems cryptic – it’s difficult to summarize, but an
> example will make it clear immediately.
> I want to write a scheme procedure, which takes a pair like #'(3 . 7) and
> returns a list with all the numbers in the range: #'(3 4 5 6 7)
> How is this done most easily?
>
> TIA, Simon



Hi Simon,

(define (foo pair)
  (if (and (integer? (car pair)) (integer? (cdr pair)))
      (iota (1+ (interval-length pair)) (car pair) 1))
      #f)

(foo '(3 . 7))
--> (3 4 5 6 7)


HTH,
  Harm