ary.permutation { |p| block } â ary
ary.permutation â Enumerator
ary.permutation(n) { |p| block } â ary
ary.permutation(n) â Enumerator
ary.permutation â Enumerator
ary.permutation(n) { |p| block } â ary
ary.permutation(n) â Enumerator
Instance Public methods
When invoked with a block, yield all permutations of length n
of the elements of the array, then return the array itself.
If n
is not specified, yield all permutations of all elements.
The implementation makes no guarantees about the order in which the permutations are yielded.
If no block is given, an Enumerator is returned instead.
Examples:
a = [1, 2, 3] a.permutation.to_a #=> [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]] a.permutation(1).to_a #=> [[1],[2],[3]] a.permutation(2).to_a #=> [[1,2],[1,3],[2,1],[2,3],[3,1],[3,2]] a.permutation(3).to_a #=> [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]] a.permutation(0).to_a #=> [[]] # one permutation of length 0 a.permutation(4).to_a #=> [] # no permutations of length 4
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