🔸Result
Swift 5.0, Xcode 10.2 新功能。
Swift > Standard Lib > Numbers and Basic Values
定義
Swift’s Result type is implemented as an enum that has two cases: success and failure.
/// represents either a success or a failure, including an
/// associated value in each case.
@frozen
public enum Result<Success, Failure: Error> {
/// A success, storing a `Success` value.
case success(Success)
/// A failure, storing a `Failure` value.
case failure(Failure)
}
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