Result

public enum Result<V>

Wraps result of throwing code and allows to map embedded value

  • Resulted in error

    Declaration

    Swift

    case error(Error)

  • Successfully aquired a value

    Declaration

    Swift

    case value(V)

Initialization

  • Init with unsafe code

    let result = Result<V> { 
  // Your unsafe code, that results either in value of type V or in error
}

    Declaration

    Swift

    public init(_ unsafe: () throws -> V)

  • Convinience init with unsafe code

     let result = Result<V> (
   // Your unsafe code, that results either in value of type V or in error
 )

    Declaration

    Swift

    public init(_ unsafe: @autoclosure () throws -> V)

Pure

  • Wraps value in Result

    Declaration

    Swift

    public static func pure(_ value: V) -> Result<V>

Wrap

  • Wrap some throwing function from U -> V in U -> Result<V> function

    Declaration

    Swift

    public static func wrap<U>(_ function: @escaping (U) throws -> V) -> ((U) -> Result)

Unwrapping

  • Get unsafe execution back, in case if you want to use do … catch after all

    Declaration

    Swift

    public func unwrap() throws -> V

  • Unwrap value as optional

    Declaration

    Swift

    public var value: V?

  • Unwrap error as optional

    Declaration

    Swift

    public var error: Error?

Map

  • If there’s no error, perform function with value and return wrapped result

    Declaration

    Swift

    public func map<U>(_ transform: (V) -> U) -> Result<U>

  • Performs transformation over value of Result.

    Declaration

    Swift

    public func forEach(_ transform: (V) -> Void)

Flat map

  • If there’s no error, perform function that may yield Result with value and return wrapped result

    Declaration

    Swift

    public func flatMap<U>(_ transform: (V) -> Result<U>) -> Result<U>

Apply

  • Apply function wrapped in Result to Result-vrapped value

    Declaration

    Swift

    public func apply<U>(_ transform: Result<(V) -> U>) -> Result<U>