Re: [Haskell-beginners] Using symbolic values in the case expression

On Thursday 11 November 2010 18:03:10, C K Kashyap wrote:

Hi, I'd like to do something like this -

Instead of doing this -

f x = case x of 1 -> "One" 2 -> "Two"

I'd like to do this -

v1 = 1 v2 = 2

f x = case of v1 -> "One" v2 -> "Two"

Is that possible?

No, case does a pattern match, it checks whether the expression matches the pattern (patterns are defined in the report, section 3.17, http://www.haskell.org/onlinereport/haskell2010/haskellch3.html#x8-580003.17), so variable names (identifiers beginning with a lower case letter) match everything.