On: Apple Developer Documentation Is Missing

[bdisnainc]

That is because you apply pattern matching when it is not really useful here, on top of avoiding a simple ternary operator.

In some languages, you simply write:

    if (user)
      nameLabel.text = user.name;
    else
      nameLabel.text = "Guest";

Or:

    nameLabel.text = user.name if user else "Guest"

Or anything along those lines. Concise, clear, no need for an extra operator.