[Haskell-cafe] Substituting values

[David Thomas]

Seems like the function is easy to define:

replaceIfEq a b c = if c == a then b else c

Then the above can be written

   replaceIfEq Foo Bar value

Or the slightly more general (in exchange for slightly more verbosity at
the call site)

replaceIf p r a = if p a then r else a

   replaceIf (== Foo) Bar value




On Fri, Dec 21, 2012 at 6:46 PM, 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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