Should we have a specialized version of find?

[paulyoung]

I'm thinking this will be better because it won't continue to process the remainder of the array after finding a match.

find :: forall a. (a -> Boolean) -> Array a -> Maybe a
find p xs = findIndex p xs >>= index x

[paulyoung]

@themattchan came up with this, which is even better:

find :: forall a. (a -> Boolean) -> Array a -> Maybe a
find f xs = unsafePartial $ unsafeIndex xs <$> findIndex f xs

[kl0tl]

This was done in #189.