blob: 5ecd218fb4445a765a21dcd393620fbf7493e59f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
{- utilities for simple data types
-
- Copyright 2013 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
module Utility.Data where
{- First item in the list that is not Nothing. -}
firstJust :: Eq a => [Maybe a] -> Maybe a
firstJust ms = case dropWhile (== Nothing) ms of
[] -> Nothing
(md:_) -> md
eitherToMaybe :: Either a b -> Maybe b
eitherToMaybe = either (const Nothing) Just
|
