Access Control for Swift Extensions
Your understanding is almost correct.
A more interesting way to put your scenario 3 would be
extension Test { // The extension has access control internal, because of what the docs say: // // > If you extend a public or internal type, any new type members you add // > will have a default access level of internal. // // Despite the extension being internal, this member is private because it's // declared explicitly here. private var prop2: String { return "" }}as well as
internal extension Test { // The compiler will give a waning here, why would you define something public // in an internal extension? public var prop2: String { return "" }}Also you might find interesting that if your class, struct or enum is internal, you will not be able to define a public extension. The same goes for a private class, struct or enum, for which you cannot define a public or internal extension.