guava-kotlin/ca.solostudios.guava.kotlin.collect/permutations

permutations

@ExperimentalGuavaCollectionsApi
inline fun <E> Collection<E>.permutations(): Collection<List<E>>(source)

Returns a Collection of all the permutations of the specified Collection.

Notes: This is an implementation of the Plain Changes algorithm for permutations generation, described in Knuth's "The Art of Computer Programming", Volume 4, Chapter 7, Section 7.2.1.2.

If the input list contains equal elements, some of the generated permutations will be equal.

An empty collection has only one permutation, which is an empty list.

Return

an immutable Collection containing all the different permutations of the original collection.

See also