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crashing.",{"id":199,"topic":9,"difficulty":129,"body":200,"options":201,"correct_key":142,"explanation":210},"019f956d-6e1b-7634-8083-828b5ff771cb","What does the nil-coalescing operator `??` do in `let value = maybeName ?? \"default\"`?",[202,204,206,208],{"key":133,"text":203},"Forces `maybeName` to unwrap and crashes if it's nil.",{"key":136,"text":205},"Always returns \"default\" regardless of maybeName",{"key":139,"text":207},"Converts maybeName to a Bool for an if-check.",{"key":142,"text":209},"Uses `maybeName`'s wrapped value if present, otherwise falls back to `\"default\"`","`??` provides a fallback: if the left-hand optional holds a value it's used, otherwise the right-hand default expression is evaluated and used instead, without ever 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