What is a good example to differentiate between fileprivate and private in Swift3

Question

This article has been helpful in understanding the new access specifiers in Swift 3. It also gives some examples of different usages of fileprivate

Answer 1

This is the explanation for swift 4. For swift 3, the difference is the private. swift 3 private cannot be accessed by its extension, only Class A itself can access.

After swift 4, fileprivate becomes a bit redundant, because person normally will not define the subclass in the same file. Private should be enough for most cases.