[Haskell-cafe] The Good, the Bad and the GUI

[Tom Ellis]

On Thu, Aug 14, 2014 at 11:28:53AM +0200, Wojtek Narczyński wrote:
> On 14.08.2014 09:19, Tom Ellis wrote:
> >On Wed, Aug 13, 2014 at 05:21:28PM -0700, John Lato wrote:
> >>On Wed, Aug 13, 2014 at 4:21 PM, Tom Ellis
> >>>     data LineItem = LineItem { name :: Maybe String
> >>>                              , quantity :: Maybe Quantity
> >>>                              , price :: Maybe Price }
> >>Rather than this definition, what about something like:
> >>
> >>     data LineItemF f = LineItem
> >>         { name :: f String
> >>         , quantity :: f Quantity
> >>         , price :: f Price }
> >It seems Wojtek already objected to this approach, though perhaps that
> >objection could be overcome
>
> Hmm, perhaps like this
> 
> LineItemFi = LineItemFi
>    { name :: StringFi
>    , quantity :: QuantityFi
>    , price :: PriceFi }
> 
> 
> data LineItemUi f = LineItemUi
>     { name :: StringUi
>     , quantity :: QuantityUi
>     , price :: PriceUi }

You didn't use f there.