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21 lines
405 B
Text
21 lines
405 B
Text
module Strain (..) where
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import List
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keep : (a -> Bool) -> List a -> List a
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keep predicate list =
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List.foldr (consIf predicate) [] list
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discard : (a -> Bool) -> List a -> List a
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discard predicate list =
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List.foldr (consIf (\v -> not <| predicate v)) [] list
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consIf : (a -> Bool) -> a -> List a -> List a
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consIf predicate value list =
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if predicate value then
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value :: list
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else
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list
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