Suggested approach: Almost every Swift developer uses
self regularly, but the question here requires to distinguish between that and the capitalized version. Start with
self, which refers to the current object your code is running inside, then move on to
Self, which refers to the current type your code is running inside. You can remember this by looking at the capital letter: we name our types using a capital first letter, so
Self refers to a type.
Estimated difficulty: Advanced
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