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#lang racket/base
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(require racket/list racket/bool)
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(provide (all-defined-out))
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(module+ test (require rackunit))
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(define (count_if pred xs)
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(length (filter-not false? (map pred xs))))
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(module+ test
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(check-equal? (count_if procedure? (list 42 null max min)) 2)) |