Jens answered your question, but I'll note two convenient shorthands:
> #lang racket
> (require racket/format)
racket/format is provided by #lang racket, so you can skip that.
This:
(define fp
(lambda (s n)
(string-append (pp_number n) " + " s)))
is the same as this:
(define (fp s n)
(string-append (pp_number n) " + " s)))
On Tue, Dec 14, 2021 at 1:48 PM Cyrille DEUSS <[email protected]>
wrote:
> #lang racket
> (require racket/format)
>
> (define pp_number
> (lambda (n)
> (~a n #:width 6 #:align 'right #:left-pad-string "0")))
>
> (define fp
> (lambda (s n)
> (string-append (pp_number n) " + " s)))
>
> (define f
> (lambda (s n)
> (format "~a + ~a" n s)))
>
> (foldl f "" '(1 2 3))
> ; works great !
>
> (foldl fp "" '(1 2 3))
> ; and why not this one ?
>
> Thanks in advance.
> Cyrille
>
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