sets

Module

sets

Module Summary

Functions for set manipulation.

Description

Sets are collections of elements with no duplicate elements. The representation of a set is undefined.

This module provides the same interface as the ordsets(3) module but with an undefined 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(term())

Exports

add_element(Element, Set1) -> Set2

Types

Returns a new set formed from Set1 with Element inserted.

del_element(Element, Set1) -> Set2

Types

Returns Set1, but with Element removed.

filter(Pred, Set1) -> Set2

Types

Filters elements in Set1 with boolean function Pred.

fold(Function, Acc0, Set) -> Acc1

Types

Folds Function over every element in Set and returns the final value of the accumulator. The evaluation order is undefined.

from_list(List) -> Set

Types

Returns a set of the elements in List.

intersection(SetList) -> Set

Types

Returns the intersection of the non-empty list of sets.

intersection(Set1, Set2) -> Set3

Types

Returns the intersection of Set1 and Set2.

is_disjoint(Set1, Set2) -> boolean()

Types

Returns true if Set1 and Set2 are disjoint (have no elements in common), otherwise false.

is_element(Element, Set) -> boolean()

Types

Returns true if Element is an element of Set, otherwise false.

is_empty(Set) -> boolean()

Types

Returns true if Set is an empty set, otherwise false.

is_set(Set) -> boolean()

Types

Returns true if Set is a set of elements, otherwise false.

is_subset(Set1, Set2) -> boolean()

Types

Returns true when every element of Set1 is also a member of Set2, otherwise false.

new() -> set()

Returns a new empty set.

size(Set) -> integer() >= 0

Types

Returns the number of elements in Set.

subtract(Set1, Set2) -> Set3

Types

Returns only the elements of Set1 that are not also elements of Set2.

to_list(Set) -> List

Types

Returns the elements of Set as a list. The order of the returned elements is undefined.

union(SetList) -> Set

Types

Returns the merged (union) set of the list of sets.

union(Set1, Set2) -> Set3

Types

Returns the merged (union) set of Set1 and Set2.

See Also

gb_sets(3), ordsets(3)

© 2010–2017 Ericsson AB
Licensed under the Apache License, Version 2.0.