This is reminiscent of the Either (exception) monad where Left values, the
exceptions, pass through unaltered, and Right values are transformable,
i.e. acted on by functions.
But I have no idea what you're trying to achieve in the bigger picture.
Help us help you by fleshing out your use case.
-- Kim-Ee
On Sat, Dec 22, 2012 at 12:46 AM, 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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