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--- !ruby/object:RI::MethodDescription
aliases: []
block_params:
comment:
- !ruby/struct:SM::Flow::P
body: When invoked with a block, yields all combinations of length <em>n</em> of elements from <em>ary</em> and then returns <em>ary</em> itself. The implementation makes no guarantees about the order in which the combinations are yielded.
- !ruby/struct:SM::Flow::P
body: When invoked without a block, returns an enumerator object instead.
- !ruby/struct:SM::Flow::P
body: "Examples:"
- !ruby/struct:SM::Flow::VERB
body: " a = [1, 2, 3, 4]\n a.combination(1).to_a #=> [[1],[2],[3],[4]]\n a.combination(2).to_a #=> [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]\n a.combination(3).to_a #=> [[1,2,3],[1,2,4],[1,3,4],[2,3,4]]\n a.combination(4).to_a #=> [[1,2,3,4]]\n a.combination(0).to_a #=> [[]] # one combination of length 0\n a.combination(5).to_a #=> [] # no combinations of length 5\n"
full_name: Array#combination
is_singleton: false
name: combination
params: |
ary.combination(n) { |c| block } -> ary
ary.combination(n) -> enumerator
visibility: public