참고 - Swift Language Guide/The Basic
참고 - Swift Language Guide/Basic Operators
Strings and Characters
참고 - Swift Language Guide/Collection Types
참고 - Swift Language Guide/Functions
참고 - Swift Language Guide/Control Flow
Structures and Classes
Properties
Enumerations
Closures
Methods
Subscripts
Inheritance
Deinitialization
Optional Chaining
Error Handling
Concurrency
Type Casting
Nested Types
Extensions
Protocols
Generics
Opaque Types
Initialization