10 Feb
2006
10 Feb
'06
11:33 a.m.
On Fri, 10 Feb 2006, Creighton Hogg wrote:
Hi, If I have something like data Patootie = Pa Int | Tootie Int and I want to pull out the indices of all elements of a list that have type constructor Tootie, how would I do that?
I thought I might be able to use findIndices, but I don't know how to express the predicate.
(\p -> case p of {Pa _ -> False; Tootie _ -> True})