[Haskell-beginners] How to add a "method" to a record

[David McBride]

Is this what you are looking for?

data Foo pl = Foo {
  label :: pl -> String,
  payload :: pl
}

On Wed, Sep 10, 2014 at 2:06 PM, martin <martin.drautzburg at web.de> wrote:

> Hello all
>
> if I have a record like
>
>         data Foo pl = Foo {
>                     label :: String,
>                     payload :: pl
>                 }
>
> how can I create a similar type where I can populate label so it is not a
> plain string, but a function which operates on
> payload? Something like
>
>         label (Foo pl) = show pl
>
>
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