function - foldr and foldl further explanations and examples - Stack Overflow
Foldable and Traversable | Tim's code stuff
Functional Programming by Examples using Haskell | PPT
SOLVED: a) Give a term that corresponds to the foldr function in Haskell. That is, your term foldr should have the property that foldr f [N1,Nj] f N1 (f Nj 4) b)