I like that. I really need to level up on Racket macros!
On Wednesday, November 21, 2018 at 3:19:55 PM UTC-5, Matthew Butterick
wrote:
>
>
> On Nov 21, 2018, at 9:30 AM, Brian Adkins <lojic...@gmail.com
> <javascript:>> wrote:
>
> Thanks guys. I think I can live with:
>
> (for ([(i j) (in-dict '(("a" . 1) ("b" . 20)))])
> (display (list i j)))
>
> I suppose I could also write something analogous to in-dict that would do
> what I want. Maybe in-tuple ?
>
>
> Or perhaps:
>
> #lang racket
> (require (for-syntax racket/syntax))
>
> (define-syntax (match-for stx)
> (syntax-case stx ()
> [(_ ([PAT SEQ] ...) . BODY)
> (with-syntax ([(TEMP ...) (map (λ (stx) (generate-temporary))
> (syntax->list #'(PAT ...)))])
> #'(for ([TEMP SEQ] ...)
> (match-let ([PAT TEMP] ...)
> . BODY)))]))
>
> (match-for ([(list i j) '(("a" 1) ("b" 20))])
> (display (list i j)))
>
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