How do `{ get }` and `{ get set }` protocol property requirements differ?

Answer: { get } only requires that the property be readable, so any kind of property satisfies it, while { get set } requires a property that is both readable and writable.

Code Example:

protocol Named {
    var name: String { get }
}

protocol Scored {
    var score: Int { get set }
}

struct A: Named { let name: String }            // ✅ stored let
struct B: Named { var name: String }            // ✅ stored var
struct C: Named { var name: String { "C" } }    // ✅ read-only computed

struct D: Scored { var score: Int }             // ✅ stored var
struct E: Scored {                              // ✅ computed get + set
    private var raw = 0
    var score: Int {
        get { raw }
        set { raw = max(0, newValue) }
    }
}
// struct F: Scored { let score: Int }          // ❌ not settable

Key Points:

• Protocols never specify stored vs computed — only the access requirements.
• { get } is a minimum: a conforming type may still expose a setter, but code that sees only the protocol type can't use it.
• Protocol property requirements are always declared with var.