Higher order functions

Question 1

What does map do

Answer 1

Maps a function to a list of elements.

Question 2

What does filter do

Answer 2

Applies a predicate to pick list elements which return true.

Question 3

Foldr

Answer 3

Folds a function into list elements.

i.e. productOf xs = foldr multiply 1 xs
xs = 1,2,3,4,5 returns 120. 11234*5