General topic questions
Optionals and Nil Coalescing
EasyCommon
Free section · general topics & algorithms
How do optionals work, and when would you use ?, !, if let, guard let, and ??
Reveal model answer
Optionals wrap absence of a value. Prefer if let/guard let for safe unwraps; ?? for defaults; avoid force unwrap (!) except when truly impossible to be nil. Optional chaining (?.) short-circuits safely.