Utitlity functions on lists.

- mhead :: [a] -> Maybe a
- type Prefix a = [a]
- type Suffix a = [a]
- maybePrefixMatch :: Eq a => Prefix a -> [a] -> Maybe (Suffix a)
- wordsBy :: (a -> Bool) -> [a] -> [[a]]
- chop :: Int -> [a] -> [[a]]
- holes :: [a] -> [(a, [a])]
- distinct :: Eq a => [a] -> Bool
- allEqual :: Eq a => [a] -> Bool
- groupBy' :: (a -> a -> Bool) -> [a] -> [[a]]
- prop_groupBy' :: (Bool -> Bool -> Bool) -> [Bool] -> Property
- groupOn :: Ord b => (a -> b) -> [a] -> [[a]]
- extractNthElement' :: Integral i => i -> [a] -> ([a], a, [a])
- extractNthElement :: Integral i => i -> [a] -> (a, [a])
- prop_extractNthElement :: Integer -> [Integer] -> Property
- genericElemIndex :: (Eq a, Integral i) => a -> [a] -> Maybe i
- prop_genericElemIndex :: Integer -> [Integer] -> Property
- tests :: IO Bool

# Documentation

maybePrefixMatch :: Eq a => Prefix a -> [a] -> Maybe (Suffix a)Source

Check if a list has a given prefix. If so, return the list minus the prefix.

wordsBy :: (a -> Bool) -> [a] -> [[a]]Source

Split a list into sublists. Generalisation of the prelude function
`words`

.

words xs == wordsBy isSpace xs

distinct :: Eq a => [a] -> BoolSource

Check whether all elements in a list are distinct from each
other. Assumes that the `Eq`

instance stands for an equivalence
relation.

allEqual :: Eq a => [a] -> BoolSource

Checks if all the elements in the list are equal. Assumes that
the `Eq`

instance stands for an equivalence relation.

groupBy' :: (a -> a -> Bool) -> [a] -> [[a]]Source

A variant of `groupBy`

which applies the predicate to consecutive
pairs.

extractNthElement' :: Integral i => i -> [a] -> ([a], a, [a])Source

gives the `extractNthElement`

n xs`n`

-th element in `xs`

(counting from 0), plus the remaining elements (preserving order).

extractNthElement :: Integral i => i -> [a] -> (a, [a])Source

prop_extractNthElement :: Integer -> [Integer] -> PropertySource

genericElemIndex :: (Eq a, Integral i) => a -> [a] -> Maybe iSource

prop_genericElemIndex :: Integer -> [Integer] -> PropertySource