組み込みクラス一覧 A〜E ARGF.class (912) Array (2214) BasicObject (168) Bignum (99) Binding (86) Class (88) Complex (576) Data (54) Dir (590) Encoding (2674) Encoding::Converter (276) Encoding::InvalidByteSequenceError (84) Encoding::UndefinedConversionError (60) Enumerator (212) Enumerator::ArithmeticSequence (98) Enumerator::Chain (42) Enumerator::Lazy (429) Enumerator::Yielder (30) Errno::EXXX (36) Excep