final and const (let) keywords | Swift

final and const (let) keywords | Swift

final

• Is used to prevent a class, method, or property from being overridden in a subclass.
• If a class is marked as “final”, no other class can inherit from it and it cannot be changed by subclassing.
• if a method is marked as “final”, it cannot be overridden in a subclass, ensuring that its implementation remains the same.

final class Button {
  final var title: String
  final func sayHello() { print("Hello") }
  init(title: String) {
    self.title = title
  }
}

const (let)

• Constants can be declared using the “let” keyword.
• Constants declared using “let” must be set to a value when they are declared and cannot be changed afterwards.
• “const” is not a keyword in Swift.

let maximumItems = 100

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