Swift

1.Data Type

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2.Type casting, Type Check

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3.연산자 (nil-coalescing operator)

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4.옵셔널 Optional

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5.함수 Function

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6.클래스 Class 와 상속 Inheritance

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7.옵셔널과 옵셔널 추출의 방법 5가지

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8.프로토콜 Protocol

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