[Haskell-beginners] pattern matching on a common element

[briand at aracnet.com]

On Fri, 25 Nov 2016 18:18:21 +0100
Daniel Trstenjak <daniel.trstenjak at gmail.com> wrote:

> Hi Brian,
> 
> > interestingly in my journeys through the intertubes I have not found a
> > single mention of using the "()" syntax in place of the
> > "{fieldname=value, ...}" syntax as the generator.  
> 
> The '()' isn't part of the 'data constructor' (the usual term for A1/A2/A3),
> but sometimes needed to help the compiler to make an unambiguous parsing of the expression.
> 
> These are all valid expressions:
> 
>     i $ A1 "foo" 3.2   -- '$' is often used to get rid of parentheses
> 
>     let a1 = A1 "foo" 3.2 in i a1
> 

oh, i see. everything's a function.

thanks!


Brian