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A.2.23
Library List
Library with some useful operations on lists.
Exported functions:
elemIndex :: a → [a] → Maybe Int
Returns the index i of the first occurrence of an element in a list as (Just i), otherwise
Nothing is returned.
elemIndices :: a → [a] → [Int]
Returns the list of indices of occurrences of an element in a list.
find :: (a → Bool) → [a] → Maybe a
Returns the first element e of a list satisfying a predicate as (Just e), otherwise Nothing
is returned.
findIndex :: (a → Bool) → [a] → Maybe Int
Returns the index i of the first occurrences of a list element satisfying a predicate as
(Just i), otherwise Nothing is returned.
findIndices :: (a → Bool) → [a] → [Int]
Returns the list of indices of list elements satisfying a predicate.
nub :: [a] → [a]
Removes all duplicates in the argument list.
nubBy :: (a → a → Bool) → [a] → [a]
Removes all duplicates in the argument list according to an equivalence relation.
delete :: a → [a] → [a]
Deletes the first occurrence of an element in a list.
(\\) :: [a] → [a] → [a]
Computes the difference of two lists.
union :: [a] → [a] → [a]
Computes the union of two lists.
intersect :: [a] → [a] → [a]
Computes the intersection of two lists.
intersperse :: a → [a] → [a]
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