Swift’s guard keyword

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Swift 2 introduced the guard keyword, which could be used to ensure that various data is configured ready to go. An example I saw on this website demonstrates an submitTapped function:

func submitTapped() {
    guard username.text.characters.count > 0 else {
        return
    }

    print("All good")
}

I am wondering if using guard is any different than doing it the old fashioned way, using an if condition. Does it give benefits, which you could not get by using a simple check?

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