Since recently, the notion of prisms from the lens library can achieve
that : to modify a value only in certain conditions but you have to
write the prism so it's not that convenient, though at least you'll
have an uniform API.
See http://hackage.haskell.org/packages/archive/lens/3.7.0.2/doc/html/Control-Le...
, especially the "nat" example.
--
Jedaï
On Fri, Dec 21, 2012 at 6:46 PM, Radical
Sometimes I'll need something like:
if value == Foo then Bar else value
Or some syntactic variation thereof:
case value of { Foo -> Bar; _ -> value }
Is there a better/shorter way to do it? I'm surprised that it's more complicated to substitute a value on its own than e.g. in a list, using filter. Or perhaps I'm missing the right abstraction?
Thanks,
Alvaro
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