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select
Dictionary
examples
{ a: 1, b: 2 }.select { |key| key == :a }
{ a: 1, b: 2 }.select { |key, value| value.one? }
{ a: 1, b: 2 }.select { |key, value, index| index.zero? }
{ a: 1, b: 2 }.select { |key, value, index, dictionary| dictionary.many? }