Swift with optional and optional chaining. [1] [1] https://docs.swift.org/swift-book/LanguageGuide/OptionalChaining.html https://docs.swift.org/swift-book/Lang

Swift with optional and optional chaining. [1] [1] https://docs.swift.org/swift-book/LanguageGuide/OptionalChaining.html https://docs.swift.org/swift-book/LanguageGuide/OptionalChai...