56 lines
1021 B
Haskell
56 lines
1021 B
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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module Ringo.Utils where
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import qualified Control.Arrow as Arrow
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import Prelude.Compat
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import Data.Maybe (mapMaybe)
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for :: [a] -> (a -> b) -> [b]
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for = flip map
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forMaybe :: [a] -> (a -> Maybe b) -> [b]
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forMaybe = flip mapMaybe
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concatFor :: (Foldable t) => t a -> (a -> [b]) -> [b]
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concatFor = flip concatMap
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infixr 3 ***, &&&
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first :: (a -> a') -> (a, b) -> (a', b)
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first = Arrow.first
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second :: (b -> b') -> (a, b) -> (a, b')
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second = Arrow.second
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(***) :: (a -> a') -> (b -> b') -> (a, b) -> (a', b')
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(***) = (Arrow.***)
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(&&&) :: (a -> b) -> (a -> c) -> a -> (b, c)
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(&&&) = (Arrow.&&&)
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(>>>) :: (a -> b) -> (b -> c) -> (a -> c)
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(>>>) = (Arrow.>>>)
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(>>-) :: a -> (a -> b) -> b
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(>>-) v f = f v
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infixr 1 >>-
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dupe :: a -> (a,a)
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dupe x = (x, x)
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both :: (a -> b) -> (a, a) -> (b, b)
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both f (x, y) = (f x, f y)
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fst3 :: (a, b, c) -> a
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fst3 (a, _, _) = a
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snd3 :: (a, b, c) -> b
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snd3 (_, b, _) = b
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thd3 :: (a, b, c) -> c
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thd3 (_, _, c) = c
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