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⬅️ Previous capture (2021-11-30)
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Update: Now part of brev-separate.
Here is a functional combinator for Scheme that lets its arguments treat their arguments as if they were lists.
((as-list (c filter odd?)) 130752)
⇒ 1375
((as-list cdr reverse) 23311358)
⇒ 5311332
((as-list delete-duplicates) 23311358)
⇒ 23158
((as-list append) 11 22)
⇒ 1122
(define (vowel? l) ((as-list (c member l)) "aeiou")) ((as-list (c filter vowel?)) "magnetic mountaintop")
⇒ “aeiouaio”
Together with over:
((as-list (over (if (vowel? x) x (char-upcase x)))) "fleet foxes")
⇒ “FLeeT FoXeS”
Here is the implementation for Chicken. It uses c from define-curry, and match-define.
(define (record? x) (and (not (##sys#immediate? x)) (##sys#structure? x (##sys#slot x 0)))) (match-define ((list-> (? integer? x)) (o string->number list->string (c map (o (cut string-ref <> 0) number->string)))) ((list-> (? string? x)) list->string) ((list-> (? vector? x)) list->vector) ((list-> (? hash-table? x)) alist->hash-table) ((list-> (? record? r)) (fn (apply ##sys#make-structure (##sys#slot r 0) x))) ((list-> (? list? x)) identity)) (match-define ((->list (? integer? x)) (map (o string->number string) (string->list (number->string x)))) ((->list (? string? x)) (string->list x)) ((->list (? vector? x)) (vector->list x)) ((->list (? hash-table? x)) (hash-table->alist x)) ((->list (? record? x)) (map (cut ##sys#slot x <>) (iota (sub1 (##sys#size x)) 1))) ((->list (? list? x)) x)) (define ((as-list . procs) . xs) (let ((ret (apply (apply compose procs) (map ->list xs)))) (if (list? ret) ((list-> (car xs)) ret) ret)))