EnumerationSwift5.9.0
Result
A value that represents either a success or a failure, including an associated value in each case.
@frozen enum Result<Success, Failure> where Failure : ErrorCitizens in Swift
Members
case failure(Failure)A failure, storing a
Failurevalue.case success(Success)A success, storing a
Successvalue.func flatMap<NewSuccess>((Success) -> Result<NewSuccess, Failure>) -> Result<NewSuccess, Failure> Returns a new result, mapping any success value using the given transformation and unwrapping the produced result.
func flatMapError<NewFailure>((Failure) -> Result<Success, NewFailure>) -> Result<Success, NewFailure> Returns a new result, mapping any failure value using the given transformation and unwrapping the produced result.
func get() throws -> Success Returns the success value as a throwing expression.
func map<NewSuccess>((Success) -> NewSuccess) -> Result<NewSuccess, Failure> Returns a new result, mapping any success value using the given transformation.
func mapError<NewFailure>((Failure) -> NewFailure) -> Result<Success, NewFailure> Returns a new result, mapping any failure value using the given transformation.
Citizens in Swift
where Success:Sendable, Failure:ErrorConformances
protocol SendableA type whose values can safely be passed across concurrency domains by copying.
Citizens in Swift
where Success:Hashable, Failure:Error, Failure:HashableConformances
protocol HashableA type that can be hashed into a
Hasherto produce an integer hash value.
Citizens in Swift
where Success:Equatable, Failure:Equatable, Failure:ErrorConformances
protocol EquatableA type that can be compared for value equality.
Features
Citizens in Swift
where Failure == ErrorMembers
init(catching: () throws -> Success) Creates a new result by evaluating a throwing closure, capturing the returned value as a success, or any thrown error as a failure.