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StreetStrider/racket-foldl-filter.rkt

Created January 10, 2014 19:36
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racket-foldl-filter.rkt
#lang racket
(define (@filter fn L)
(foldl
(lambda (i A)
(if (fn i)
(append A (list i))
A
)
)
empty
L
)
)
(print (@filter positive? '(-1 -2 3 4 7 -0 -5)))
(newline)
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