swift

1.Error Handling

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2.구조체와 클래스

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3.프로퍼티

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4.메서드

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5.서브 스크립트

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6.확장(Extensions)

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7.초기화 (Initialization)

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8.열거형

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9.LocalizedError, 화면전환 방식

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10.Singleton Pattern

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