fire an publisher after another

Question

I want to fire two publishers but second should only fire when first one is complete. I tried it with zip could not achieve it. Following is my code:

    let resetPasscodeConfirmationPublisher = authUseCase.resetPasscodeConfirmation(phoneNumber: phoneNumber, code: pincode, passcode: passcode)
        
    
    let getAuthTokenPublisher = authUseCase.getAccessToken(passcode: passcode)
        
        resetPasscodeConfirmationPublisher.zip(getAuthTokenPublisher).sink { res in
            print(res)
        } receiveValue: { values in
            print(values.0)
            print(values.1)
        }.store(in: &cancellables)

so first, resetPasscodeConfirmationPublisher should run and when it is done and I get some value from it getAuthTokenPublisher should run. Right now I am getting response from getAuthTokenPublisher only and not from the first publisher.

Answer 1

You can use a map operator to do that

resetPasscodeConfirmationPublisher
    .map { result in
        // do what you need with the result
        return getAuthTokenPublisher
    }
    .switchToLatest()
    .sink(
        receiveCompletion: { completion in

        },
        receiveValue: { value in

        }
    )
    .store(in: &cancellables)