Comments (5)
FYI: scanl1
, scanr1
aren't partial
from rio.
In principle: I'm OK with this approach. I'm not convinced that safe
will be the right prefix in all cases. For example: maximum
would probably be better replaced by maximumMay
or maximumMaybe
to match existing naming conventions IMO.
from rio.
That is fair, honestly, my intent was not to strongly advocate names, may I create a pull request and we revisit the names as we go?
from rio.
Implemented in #96
from rio.
Late entry, but perhaps relevant... yesterday I had to switch some lists over to vectors so I could use statistics
operations on them. I had been using some of the (list-specific) *Def
functions from safe
, and needed to replicate those; and some of the statistics
operations I wanted were partial on empty vectors, too, which needed fixing. I wound up writing this:
defaulting :: Foldable f => b -> (f a -> b) -> f a -> b
defaulting d f xs
| null xs = d
| otherwise = f xs
So now I have e.g. defaulting 0 Vector.maximum
. The *Maybe
pattern is a trivial special case:
mayhap :: Foldable f => (f a -> b) -> f a -> Maybe b
mayhap f = defaulting Nothing (Just . f)
Are there any particular downsides to this technique? It seems far more elegant than a slew of specialized, type-specific functions.
Edit: https://hackage.haskell.org/package/safe-foldable
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