Using map() and flatMap() on optionals you can chain multiple operations without having to use lengthy if lets or guards:

// BEFORE

guard let string = argument(at: 1) else {
    return
}

guard let url = URL(string: string) else {
    return
}

handle(url)

// AFTER

argument(at: 1).flatMap(URL.init).map(handle)

Support Swift by Sundell by checking out this sponsor:

Bitrise: My favorite continuous integration service. Automatically build, test and distribute your app on every Pull Request — which lets you quickly get feedback on each change that you make. Start 2021 with solid continuous integration from Bitrise, using hundreds of ready-to-use steps.