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| sets(3erl) | Erlang Module Definition | sets(3erl) |
NAME¶
sets - Functions for Set ManipulationDESCRIPTION¶
Sets are collections of elements with no duplicate elements. The representation of a set is not defined. This module provides exactly the same interface as the module ordsets but with a defined representation. One difference is that while this module considers two elements as different if they do not match ( =:=), ordsets considers two elements as different if and only if they do not compare equal ( ==).DATA TYPES¶
set(Element)
As returned by new/0.
set()
set() is equivalent to set(term()).
EXPORTS¶
new() -> set()
Returns a new empty set.
is_set(Set) -> boolean()
Types:
Set = term()
Returns true if Set is a set of elements, otherwise
false.
size(Set) -> integer() >= 0
Types:
Set = set()
Returns the number of elements in Set.
to_list(Set) -> List
Types:
Set = set(Element)
List = [Element]
Returns the elements of Set as a list.
from_list(List) -> Set
Types:
List = [Element]
Set = set(Element)
Returns an set of the elements in List.
is_element(Element, Set) -> boolean()
Types:
Set = set(Element)
Returns true if Element is an element of Set, otherwise
false.
add_element(Element, Set1) -> Set2
Types:
Set1 = Set2 = set(Element)
Returns a new set formed from Set1 with Element inserted.
del_element(Element, Set1) -> Set2
Types:
Set1 = Set2 = set(Element)
Returns Set1, but with Element removed.
union(Set1, Set2) -> Set3
Types:
Set1 = Set2 = Set3 = set(Element)
Returns the merged (union) set of Set1 and Set2.
union(SetList) -> Set
Types:
SetList = [set(Element)]
Set = set(Element)
Returns the merged (union) set of the list of sets.
intersection(Set1, Set2) -> Set3
Types:
Set1 = Set2 = Set3 = set(Element)
Returns the intersection of Set1 and Set2.
intersection(SetList) -> Set
Types:
SetList = [set(Element), ...]
Set = set(Element)
Returns the intersection of the non-empty list of sets.
is_disjoint(Set1, Set2) -> boolean()
Types:
Set1 = Set2 = set(Element)
Returns true if Set1 and Set2 are disjoint (have no
elements in common), and false otherwise.
subtract(Set1, Set2) -> Set3
Types:
Set1 = Set2 = Set3 = set(Element)
Returns only the elements of Set1 which are not also elements of
Set2.
is_subset(Set1, Set2) -> boolean()
Types:
Set1 = Set2 = set(Element)
Returns true when every element of Set11 is also a member of
Set2, otherwise false.
fold(Function, Acc0, Set) -> Acc1
Types:
Function = fun((Element, AccIn) -> AccOut)
Set = set(Element)
Acc0 = Acc1 = AccIn = AccOut = Acc
Fold Function over every element in Set returning the final value
of the accumulator.
filter(Pred, Set1) -> Set2
Types:
Pred = fun((Element) -> boolean())
Set1 = Set2 = set(Element)
Filter elements in Set1 with boolean function Pred.
SEE ALSO¶
ordsets(3erl), gb_sets(3erl)| stdlib 2.2 | Ericsson AB |