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https://www.google.com/accounts/o8/id?id=AItOawnq-RfkVpFN15SWvQ2lpSGAi0XpNQuLxKM 2014-07-06 10:45:04 +00:00 • committed by admin
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[[!comment format=mdwn
username="https://www.google.com/accounts/o8/id?id=AItOawnq-RfkVpFN15SWvQ2lpSGAi0XpNQuLxKM"
nickname="Yuval"
subject="What about safe?"
date="2014-07-06T10:44:05Z"
content="""
https://hackage.haskell.org/package/safe
> A library wrapping Prelude/Data.List functions that can throw exceptions, such as head and !!. Each unsafe function has up to four variants, e.g. with tail:
>
> tail :: [a] -> [a], raises an error on tail [].
> tailMay :: [a] -> Maybe [a], turns errors into Nothing.
> tailDef :: [a] -> [a] -> [a], takes a default to return on errors.
> tailNote :: String -> [a] -> [a], takes an extra argument which supplements the error message.
> tailSafe :: [a] -> [a], returns some sensible default if possible, [] in the case of tail.
"""]]