Class

• Can be used against
  1. Computed properties in Classes
  2. Methods in Classes

• Using this causes
  1. The Property/Method to become part of the Type instead of Instance.

• Example

class Apple {
    class var price : Double { return 1.5 }
    class func weight() -> Int { return 1 }
}

Final

• Can be used against
  1. Stored/Computed Properties in Classes
  2. Methods in Classes
  3. Classes

• Using this causes
  1. Prevention of further overriding of the Property/Method in a Subclass
  2. Prevention of Sub classing in the case of Classes

•  Examples

class Apple {
    final var price : Double = 1.5    
    final func weight() -> Int { return 1 }
}

final class Orange {
    var price : Double = 2.5
    func weight() -> Int { return 2 }
}

Static

• Can be used against
  1. Stored/Computed Properties in Classes, Structures, Enumerations
  2. Methods in Classes, Structures, Enumerations

• Using this causes
  1. The Property/Method to become part of the Type instead of Instance (similar to Class keyword)
  2. Prevention of further overriding of the Property/Method (similar to Final keyword)

• Example

struct Mango {
    static var price: Double = 3.5
    static func weight() -> Int { return 3 }
}