guard let value1 = number1, let value2 = number2 else { return }<br />

func submit() {<br /> guard let name = nameField.text else {<br /> show(“No name to submit”)<br /> return<br /> }</p> <p> guard let address = addressField.text else {<br /> show(“No address to submit”)<br /> return<br /> }</p> <p> guard let phone = phoneField.text else {<br /> show(“No phone to submit”)<br /> return<br /> }</p> <p> sendToServer(name, address: address, phone: phone)<br /> }</p> <p>func sendToServer(name: String, address: String, phone: String) {<br /> …<br /> }

func checkAge() {</p> <p> var age: Int? = 22</p> <p> guard let myAge = age else {<br /> print(“Age is undefined”)<br /> return<br /> }</p> <p> print(“My age is \(myAge)”)<br /> }</p> <p>checkAge()