Generic Structure

Just

A publisher that emits an output to each subscriber just once, and then finishes.

Declaration

struct Just<Output>

Overview

You can use a Just publisher to start a chain of publishers. A Just publisher is also useful when replacing a value with Publishers.Catch.

In contrast with Result.Publisher, a Just publisher can’t fail with an error. And unlike Optional.Publisher, a Just publisher always produces a value.

Topics

Creating a Just Publisher

init(Output)

Initializes a publisher that emits the specified output just once.

Instance Properties

let output: Output

The one element that the publisher emits.

Instance Methods

func contains(Output) -> Just<Bool>
func contains(Output) -> Publishers.Contains<Just<Output>>
func max() -> Just<Output>
func max() -> Publishers.Comparison<Just<Output>>
func min() -> Just<Output>
func min() -> Publishers.Comparison<Just<Output>>
func removeDuplicates() -> Just<Output>
func switchToLatest() -> Publishers.SwitchToLatest<Output, Just<Output>>

Relationships

Conforms To

See Also

Convenience Publishers

class Future

A publisher that eventually produces a single value and then finishes or fails.

struct Deferred

A publisher that awaits subscription before running the supplied closure to create a publisher for the new subscriber.

struct Empty

A publisher that never publishes any values, and optionally finishes immediately.

struct Fail

A publisher that immediately terminates with the specified error.

struct Record

A publisher that allows for recording a series of inputs and a completion, for later playback to each subscriber.