[Haskell-beginners] containers and extensibility, typeclasses vs. multiple value constructors

[Stephen Tetley]

Hello Greg

Supposing you are working with GnuPlot - one option is to make Plot a
functional type that takes a list of some polymorphic input data and
generates a 'GnuPlot' - where GnuPlot is a type representing output in
the GnuPlot format.

type Plot a = [a] -> GnuPlot

Or if GnuPlot accepts drawing styles...

type Plot a = [a] -> DrawingStyle -> GnuPlot

Plots are just functions, so clearly you can define as many as you
like and they are all the same type.

Best wishes

Stephen