Re: [Haskell-beginners] pattern matching on a common element

Hi Rahul, On Fri, Nov 25, 2016 at 12:06:06PM +0530, Rahul Muttineni wrote:

data X =   A1 { name :: String, d :: Double} | A2 { name :: String, i :: Int} | A3 { name :: String, d1 :: Double, i1 :: Int}

Now you can use `name` directly to get the string component of the different variants.

It's not recommended to mix record syntax and ADTs, because you can get runtime errors that the compiler can't catch during compile time, like calling: i (A1 "foo" 3.2) If you're having the same field in all variants, then an other approach might be better: data A = Ai Int | Ad Double | Aid Int Double data X = X { name :: String, a :: A } Greetings, Daniel