I'm a beginner too but, if I am not wrong, then you will not be able to
write a function that can receive input of type [[a]] as well as input of
type [[[a]]].
Is that the behaviour that you have in mind?
On Thu, Apr 8, 2010 at 09:08, Ben Derrett
Hi, I'm trying to write a generalization of the map function that operates on nested lists, e.g. [[a]] or [[[a]]]. (It should map all elements of type a (not list) with f)
I was thinking of something along these lines: mapN f *list of type [a] (where a is not a list type)* = map f l mapN f l = (mapN f (head l)):(mapN f (tail l))
Any suggestions about how to go about this?
Many thanks,
Ben
-- Ben Derrett Department of Mathematics MIT Class of 2012 bderrett@mit.edu
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