Haskell function library PDF

Preview

Summary

Haskell programming language function library...

Description

filter :: (a -> Bool) -> [a] -> [a]

Takes in a function and a list to return a list.

e.g. ex2> filter (==1) [1,2,3,2,1] [1,1] e.g.2: ex2> filter (=='a') ''Ciaone friends'' "a" even :: Int -> Bool

Returns true if the Int is even.

e.g. ex2> even 2 True e.g.2: ex2> filter (even) [1..10] [2,4,6,8,10] odd :: Int -> Bool

Returns true if the Int is odd.

map :: (a->b) -> [a] -> [b]

Takes a function that transforms values of type a into values of type a and returns a list of things of type b. (Note: a and b aren't necessarily different types)

e.g.: ex2> map (>2) [1,2,3] [False,False,True] length :: [a] -> Int

Returns the number of elements in a list

head :: [a] -> a

Returns the first element of a list

last :: [a] -> a

Returns the last element of a list...