Exercise 1: Why Refactor -> Rename Beats Find-and-Replace — Possible Solution
=============================================================================

TASK
Explain why renaming a method with Xcode's Refactor command is safer than
find-and-replace.

ANSWER
The sources describe the refactoring engine as able to transform code
locally within one Swift file or globally, renaming a method or property
that occurs in multiple files and even different languages. It works on the
structure of the code, so it renames real uses of that method.

Plain find-and-replace works on text. It can change unrelated words that
happen to match, and it does not know which occurrences refer to the same
method.

CAUTION
The claim about structural awareness is my reading of the description, and
the chapter did not test a rename. After any refactor, build and run your
tests.