What data types exist in Swift?

In Swift, the following main data types exist:

1. Primitive types:
   • Integer types: Int (default, platform-dependent), Int8, Int16, Int32, Int64, and their unsigned counterparts UInt8, UInt16, UInt32, UInt64.
   • Floating point: Float (32-bit representation), Double (64-bit representation, default).
   • Boolean values: Bool (takes values true or false).
2. Strings and Characters: String, Character.
3. Collections:
   • Arrays: Array (ordered collection allowing duplicates).
   • Sets: Set (unordered collection of unique values).
   • Dictionaries: Dictionary (unordered collection of key-value pairs, where keys are unique).
4. Tuples: Tuple (grouping multiple values of different types into a single composite value).
5. Optional types: Optional (represents either a value of a certain type or absence of a value (nil)).
6. Structures: struct (value types).

   struct Point {
       var x: Int
       var y: Int
   }
   

7. Classes: class (reference types).

   class Person {
       var name: String
       init(name: String) {
           self.name = name
       }
   }
   

8. Enumerations: enum (group of related values).

   enum Direction {
       case up, down, left, right
   }
   

9. Function types: (Parameters) -> ReturnType (represent closures and functions).

   let greeting: (String) -> String = { name in
       return "Hello, \(name)!"
   }