Here's a quick example using ghci: Prelude> let a = Person length Prelude> :type a a :: Person Prelude> (firstName a) "Bob" 3 On Tue, May 5, 2015 at 10:19 PM, Shishir Srivastava < shishir.srivastava@gmail.com> wrote:
Hi,
Could anyone please have a look and let me know how you can create the instance of this data type ?
--- data Person = Person { firstName ::String -> Int } ---
I've seen this type of syntax in a lot of places in haskell code where a new data type is defined in terms of functions rather than concrete data types.
I am not trying to achieve anything out of this but purely as an exercise in understanding the record syntax.
As far as I understand the data type is function based and takes a 'function' instead of a value of a concrete type so how does one create an instance of this type.
Thanks, Shishir
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