Re: [Haskell-cafe] Dealing with heterogeneously-typed lists?

13 Aug 2008


      On 13 Aug 2008, at 00:44, Leif Warner wrote:
...
Hi all,
I'm dealing with some datatype, say:
data Invoice =
    Invoice       { invoiceNum    :: String,
                    dollarAmt     :: Currency,
                    printDate     :: Date,
dueDate       :: Date,
                    vendorNum     :: Int,
                    vendorName    :: String,
                    isStock       :: Bool,
                  }
You probably don't want to put these things into a list at all.   
Instead, you want to define an Instance of the Show class for Invoice.
Bob

Re: [Haskell-cafe] Dealing with heterogeneously-typed lists?

Thomas Davie