append(_:)
Appends a publisher’s output with the specified sequence.
Declaration
func append<S>(_ elements: S) -> Publishers.Concatenate<Self, Publishers.Sequence<S, Self.Failure>> where S : Sequence, Self.Output == S.ElementParameters
- elements:
A sequence of elements to publish after this publisher’s elements.
Return Value
A publisher that appends the sequence of elements after this publisher’s elements.
Discussion
Use append(_:) to append a sequence to the end of a publisher’s output.
In the example below, the append(_:) publisher republishes all elements from groundTransport until it finishes, then publishes the members of airTransport:
let groundTransport = ["car", "bus", "truck", "subway", "bicycle"]
let airTransport = ["parasail", "jet", "helicopter", "rocket"]
cancellable = groundTransport.publisher
.append(airTransport)
.sink { print("\($0)", terminator: " ") }
// Prints: "car bus truck subway bicycle parasail jet helicopter rocket"