Functions

The following functions are available globally.

  • A publisher that immediately throws

    – Use case Sometimes a function returns a publisher, but we need to unwap a value or perform a try catch before a publisher can be created. In this instance we can return this publisher instead to allow the publisher chain to handle those errors.

    Declaration

    Swift

    public func ThrowingPublisher<T>(forType type: T.Type, throws error: Error) -> AnyPublisher<T, Error>

    Parameters

    type

    The expected type of the publisher
    error

    The error to throw

    Return Value

    AnyPublisher That fails immediately

  • Unwrap or throw

    Throws

    The error from the right 
        var x: Int? = nil
    let y = try x ??? SomeError() // Throws some Error

    var value: Int? = 1
    let z = try value ??? SomeError() // unwraps value

    Declaration

    Swift

    public func ??? <T>(left: Optional<T>, right: Error) throws -> T

    Parameters

    left

    Any Optional
    right

    Error

    Return Value

    The unwrapped optional from the left

  • Runs the passed function on the main thread

    Declaration

    Swift

    public func onMain(_ execute: @escaping () -> Void)

    Parameters

    execute

    A function to execute on the main thread