[Tip] Note to self, don't do outer scope enum/struct declaration, try nested instead.

[vinhnx]

Note to self, don't do outer scope enum/struct declaration, try nested instead.

Be friend with Swift's name-spacing (nested) feature to better code management.

// Preferred
class SomeClass {

  // MARK: ENUM

  enum SomeType {
    case foo, bar, baz, unknown
  }

  // MARK: PROPERTIES

  private var type = SomeType.unknown
}

Sometimes SomeType is supposed to be private. But if we declare outside of class/struct declaration, it is default to public scope.

To mark it private, we can use private (for inside this class or it's extension in Swift 4) or fileprivate (inside this class only); but that is not the point here.

So if we declare as nested. It means SomeClass owns SomeType enum, so callers need explicit call SomeClass.SomeType.

// Not Preferred

enum SomeType {  // exposed
 case foo, bar, baz, unknown
}

class SomeClass {

  // MARK: PROPERTIES

  private var type = SomeType.unknown
}

Reference: #46

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