Struct

• Should use by default where possible.
• Subject should be small with not much going on.
• Use a Class if things get more complicated.
• It’s a value type. (Post TBC - Value type vs Reference type)
• Stored on the stack.
• If it is a class member, it is stored on the heap.
• Copied (Passed by value).
• Protocol conformance.
• Comes with a memberwise initializer (Post TBC - Memberwise initializers).
• Extension keeps memberwise initializer (Post TBC - Extending a struct).
• Examples: String, Array, Dict, Int.
• Thread safe.
• Used a lot in protocol orientated programming.
• No dynamic memory allocation.
• Reference counting does not apply (Post TBC - ARC).
• Protocols allow classes, structs and enums to participate in a form of inheritance (Post TBC - Protocols).

Example:

struct Size {
  let width: Int
  let height: Int
}

Related articles:

• Class
• Struct vs Class

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