| Safe Haskell | None |
|---|---|
| Language | GHC2021 |
GHC.Data.List.SetOps
Description
Set-like operations on lists
Avoid using them as much as possible
Synopsis
- unionLists :: (HasDebugCallStack, Outputable a, Eq a) => [a] -> [a] -> [a]
- unionListsOrd :: (HasDebugCallStack, Outputable a, Ord a) => [a] -> [a] -> [a]
- minusList :: Ord a => [a] -> [a] -> [a]
- type Assoc a b = [(a, b)]
- assoc :: Eq a => String -> Assoc a b -> a -> b
- assocMaybe :: Eq a => Assoc a b -> a -> Maybe b
- assocUsing :: (a -> a -> Bool) -> String -> Assoc a b -> a -> b
- assocDefault :: Eq a => b -> Assoc a b -> a -> b
- assocDefaultUsing :: (a -> a -> Bool) -> b -> Assoc a b -> a -> b
- hasNoDups :: Eq a => [a] -> Bool
- removeDups :: (a -> a -> Ordering) -> [a] -> ([a], [NonEmpty a])
- removeDupsOn :: Ord b => (a -> b) -> [a] -> ([a], [NonEmpty a])
- nubOrdBy :: (a -> a -> Ordering) -> [a] -> [a]
- findDupsEq :: (a -> a -> Bool) -> [a] -> [NonEmpty a]
- equivClasses :: (a -> a -> Ordering) -> [a] -> [NonEmpty a]
- getNth :: Outputable a => [a] -> Int -> a
- isIn :: Eq a => String -> a -> [a] -> Bool
- isn'tIn :: Eq a => String -> a -> [a] -> Bool
Documentation
unionLists :: (HasDebugCallStack, Outputable a, Eq a) => [a] -> [a] -> [a] Source #
Assumes that the arguments contain no duplicates
unionListsOrd :: (HasDebugCallStack, Outputable a, Ord a) => [a] -> [a] -> [a] Source #
Combines the two lists while keeping their order, placing the first argument first in the result.
Uses a set internally to record duplicates. This makes it slightly slower for very small lists but avoids quadratic behaviour for large lists.
minusList :: Ord a => [a] -> [a] -> [a] Source #
Calculate the set difference of two lists. This is O((m + n) log n), where we subtract a list of n elements from a list of m elements.
Extremely short cases are handled specially: When m or n is 0, this takes O(1) time. When m is 1, it takes O(n) time.
assocMaybe :: Eq a => Assoc a b -> a -> Maybe b Source #
Lookup key, fail gracefully using Nothing if not found.
assocDefault :: Eq a => b -> Assoc a b -> a -> b Source #
assocDefaultUsing :: (a -> a -> Bool) -> b -> Assoc a b -> a -> b Source #
removeDups :: (a -> a -> Ordering) -> [a] -> ([a], [NonEmpty a]) Source #
Remove the duplicates from a list using the provided comparison function. Might change the order of elements.
Returns the list without duplicates, and accumulates all the duplicates in the second component of its result.
removeDupsOn :: Ord b => (a -> b) -> [a] -> ([a], [NonEmpty a]) Source #
nubOrdBy :: (a -> a -> Ordering) -> [a] -> [a] Source #
Remove the duplicates from a list using the provided comparison function.
findDupsEq :: (a -> a -> Bool) -> [a] -> [NonEmpty a] Source #
equivClasses :: (a -> a -> Ordering) -> [a] -> [NonEmpty a] Source #
getNth :: Outputable a => [a] -> Int -> a Source #