A simple combine sample. Good code? Could it be better?

InOut.swift

class InOut: ObservableObject {
    @Published var input = ""
    @Published private (set) var output = "output"

    private var publisher: AnyCancellable?
    init() {
        publisher = $input.map({
            String($0.reversed())
        }).assign(to: \.output, on: self)
    }
}

You could avoid the force unwrap of publisher if you change it to an array and initialize it before as an empty array. Then append the cancellable that you created in init to this array. This way you could also manage several cancellables.

Updated with some helpful input