Classes and Structures - seamanhzhang/Swift GitHub Wiki

• Classes define with class keyword, and structure define with struct keyword:

class SomeClass {
   // class definition goes here
}

struct SomeStructure {
   // structure definition goes here
}

• Structures and Enumerations are Value Types.

• Classes are Reference Types

• Can sometimes be useful to find out if two constants or variables refer to exactly the same instance of a class. Swift provides two identity operators:

  • Identical to (===)
  • Not identical to (!==)