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production
key
Dictionary
examples
{ a: 1, b: 2 }.key(1)
{ a: 1, b: 2 }.key(3)
{ a: 1, b: 2 }.key(3) { |key| key + 1 }
{ a: 1, b: 2 }.key(3) { |key, dictionary| dictionary.key(1) }