[Haskell-beginners] pattern matching on a common element

[briand at aracnet.com]

On Thu, 24 Nov 2016 23:09:26 -0800
Jeffrey Brown <jeffbrown.the at gmail.com> wrote:

> You still can! Using Rahul's solution, that is.

but wouldn't i have to write
 
  A1 {name="a1", d="2.0}
  A2 {name="a2", i=2}

etc...

?

That would be ok for these simple examples, but for my actual code the field names would not be just 1 or 2 characters.


Brian

> 
> On Thu, Nov 24, 2016 at 11:08 PM, <briand at aracnet.com> wrote:
> 
> > On Fri, 25 Nov 2016 12:06:06 +0530
> > Rahul Muttineni <rahulmutt at gmail.com> 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.
> > >
> > > Hope that helps!  
> >
> > oops, i forgot to mention.
> >
> > i'd like to be able to write my code;
> >
> > x =  [ A1 "a1" 2.0, A2 "a2" 3 ]
> >
> > etc... to save myself a lot of typing.
> >
> >
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> >  
> 
> 
>