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

Stephen Tetley stephen.tetley at gmail.com
Mon Sep 6 10:57:07 EDT 2010

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


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