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UPGRADE YOUR SKILLS: Learn advanced Swift and SwiftUI on Hacking with Swift+! >>
Question 1/12: Which of these statements are true?
Hint: If you're not sure, try looking at or running your code. Click to show.
Weak references must be unwrapped before use; unowned references can be used directly.
isEmpty
count == 0
isEmpty can return false as soon as it knows at least one item exists, where count == 0 has to count all the letters in a string.
Correct!
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