Swift

• variable declaration
  • let declares a constant. Its value cannot be changed after it’s set
  • var declares a variable. Its value can be changed later
• data types

  let pi: Double = 3.14
  let isActive: Bool = true
  let message: String = "Hello, Swift!"
  

• functions

  func greet(name: String) -> String {
    return "Hello, \(name)!"
  }
  

• Object-oriented programming

  Optional

  Protocol-oriented programming

  Swift Package Manager

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