[Haskell-cafe] Substituting values

[Kim-Ee Yeoh]

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 <radical at google.com> wrote:

> 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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