I decide to make a standalone package: http://hackage.haskell.org/package/if

Cheers!

Winter

On 17 Nov 2016, at 18:19, Henning Thielemann <lemming@henning-thielemann.de> wrote:

On Thu, 17 Nov 2016, Yitzchak Gale wrote:

Anyway, bool is the natural parameter order in Haskell.
I'll make more explicit what others have already said, with
this analogy:

maybe (if it fails) (if it succeeds) (input data)
either (if it fails) (if it succeeds) (input data)

foldl (if it's null) (if it's not null) (input data)
foldr (if it's null) (if it's not null) (input data)

Unfortunately, it is the other way round:

foldl (if it's not null) (if it's null) (input data)
foldr (if it's not null) (if it's null) (input data)
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