List

The List library collects operations over integer lists ([Int]). Bring it into scope with import List.

The functions are grouped by purpose below; each table lists a function and its type.

Table of contents

• Basic operations
• Transforming lists
• Folding and scanning
• Searching and predicates
• Aggregating
• Extracting sublists
• Indexing and comparison
• Zipping

Basic operations

Function	Type
head	[Int] -> Int
last	[Int] -> Int
tail	[Int] -> [Int]
init	[Int] -> [Int]
singleton	Int -> [Int]
null	[Int] -> Bool
length	[Int] -> Int
reverse	[Int] -> [Int]

Transforming lists

Function	Type
map	(Int -> Int) -> [Int] -> [Int]
intersperse	Int -> [Int] -> [Int]
concatMap	(Int -> [Int]) -> [Int] -> [Int]
filter	(Int -> Bool) -> [Int] -> [Int]
partition	(Int -> Bool) -> [Int] -> ([Int], [Int])

Folding and scanning

Function	Type
foldl	forall a:*T . (a -> Int -> a) -> a -> [Int] -> a
foldr	forall a:*T . (Int -> a -> a) -> a -> [Int] -> a
scanl	(Int -> Int -> Int) -> Int -> [Int] -> [Int]
scanl1	(Int -> Int -> Int) -> [Int] -> [Int]
scanr	(Int -> Int -> Int) -> Int -> [Int] -> [Int]
scanr1	(Int -> Int -> Int) -> [Int] -> [Int]
mapAccumL	forall a:*T . (a -> Int -> (a, Int)) -> a -> [Int] -> (a, [Int])
mapAccumR	forall a:*T . (a -> Int -> (a, Int)) -> a -> [Int] -> (a, [Int])

Searching and predicates

Function	Type
any	(Int -> Bool) -> [Int] -> Bool
all	(Int -> Bool) -> [Int] -> Bool
elem	Int -> [Int] -> Bool
notElem	Int -> [Int] -> Bool

Aggregating

Function	Type
sum	[Int] -> Int
product	[Int] -> Int
maximum	[Int] -> Int
minimum	[Int] -> Int

Extracting sublists

Function	Type
take	Int -> [Int] -> [Int]
drop	Int -> [Int] -> [Int]
splitAt	Int -> [Int] -> ([Int], [Int])
takeWhile	(Int -> Bool) -> [Int] -> [Int]
dropWhile	(Int -> Bool) -> [Int] -> [Int]
span	(Int -> Bool) -> [Int] -> ([Int], [Int])
break	(Int -> Bool) -> [Int] -> ([Int], [Int])

Indexing and comparison

Function	Type
nth	[Int] -> Int -> Int
elemAt	[Int] -> Int -> Int
equal	[Int] -> [Int] -> Bool

Zipping

Function	Type
zipWith	(Int -> Int -> Int) -> [Int] -> [Int] -> [Int]
zipWith3	(Int -> Int -> Int -> Int) -> [Int] -> [Int] -> [Int] -> [Int]