Call completion block when two other completion blocks have been called

Question

I have a function doEverything that takes a completion block. It calls two other functions, doAlpha and doBeta which both have complet

Answer 1

Ahmad F's answer is correct but, as my functions with callbacks return immediately (like most do) and the callbacks are executed later, I don't need to create a new queue. Here's the original code with changes to make it work.

func doEverything(completion: @escaping (success) -> ())) {
    var alphaSuccess = false
    var betaSuccess = false

    let group = DispatchGroup()

    group.enter()
    doAlpha { success in
        alphaSuccess = success
        group.leave()
    }

    group.enter()
    doBeta { success in
        betaSuccess = success
        group.leave()
    }

    group.notify(queue: DispatchQueue.main) {
        completion(alphaSuccess && betaSuccess)
    }
}

I didn't really want to force the completion call onto the main thread, but hey ¯\_(ツ)_/¯