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shirok/gist:19953e667a1084918b0e49b52fbad623

Created December 16, 2021 01:39
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gistfile1.txt
(define (filter pred xs)
(define (skip xs)
(cond [(null? xs) xs]
[(pred (car xs)) xs]
[else (skip (cdr xs))]))
(unfold (^[xs] (null? (skip xs)))
(^[xs] (car (skip xs)))
(^[xs] (cdr (skip xs)))
xs))
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