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opt
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ruby18
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ri
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1.8
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Array
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Filename :
combination-i.yaml
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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