If ifThenElse is good for RebindableSyntax, then I'm +1 on that (but I've
never played with that extension, so I don't really know). I'm -1 on (?).
We already have bool, which tends to be rather more useful when partially
applied.
On Nov 16, 2016 9:43 PM, "winter"
It seems this’s a very old request, see https://wiki.haskell.org/If-then-else. I’d like to see following:
ifThenElse :: Bool -> a -> a -> a ifThenElse True x _ = xifThenElse False _ y = y
infixr 1 ?(?) :: Bool -> a -> a -> a(?) = ifThenElse
in Date.Bool module, it will have advantages that:
+ It’s more composable than syntax.
+ Write (xxx ? yyy $ zzz) instead of (if xxx then yyy else zzz) is more consistent with (f . g $ x) style, and save key strokes.
+ In module with RebindableSyntax enabled, you can import ifThenElse to get default behavior.
Whether or not to be exported by Prelude is another question, but Data.Bool seems a good place to start with.
Cheers~
Winter
_______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries