Utils
writeError
:: String -> IO ()
mapBoth
:: (a -> a) -> (a, a) -> (a, a)
mapPartTimes
:: (a -> a) -> ((a, a), (a, a)) -> ((a, a), (a, a))
mapFst
:: (a -> b) -> (a, c) -> (b, c)
mapSnd
:: (a -> b) -> (c, a) -> (c, b)
delta
:: Num a => (a, a) -> a
mid
:: Fractional a => (a, a) -> a
The midpoint of two values
removeCommon
:: Eq a => [a] -> [a] -> ([a], [a])
readMaybe
:: Read a => String -> Maybe a
(!!!)
:: [a] -> Int -> a
like !!
selects n
th element from xs
, but wraps over at the end of xs
>>> map ((!!!) [1,3,5]) [0,1,2,3,4,5][1,3,5,1,3,5]
nth
:: Int -> [a] -> Maybe a
Safer version of !!
accumulate
:: Num t => [t] -> [t]
enumerate
:: [a] -> [(Int, a)]
enumerate a list of things
>>> enumerate ["foo","bar","baz"][(1,"foo"), (2,"bar"), (3,"baz")]
wordsBy
:: (a -> Bool) -> [a] -> [[a]]
split given list of a
by given single a
, e.g.
>>> wordsBy (== ':') "bd:3"["bd", "3"]
matchMaybe
:: Maybe a -> Maybe a -> Maybe a
fromRight
:: b -> Either a b -> b