SWIFT

swift guard let

func submit() {
    guard let name = nameField.text else {
        show("No name to submit")
        return
    }

    guard let address = addressField.text else {
        show("No address to submit")
        return
    }

    guard let phone = phoneField.text else {
        show("No phone to submit")
        return
    }

    sendToServer(name, address: address, phone: phone)
}

func sendToServer(name: String, address: String, phone: String) {
  ...
}

guard let swift

guard let value1 = number1, let value2 = number2 else { return }

Swift guard-let Statement

func checkAge() {
	
  var age: Int? = 22

  guard let myAge = age else {
    print("Age is undefined")
    return
  }

  print("My age is (myAge)")
}

checkAge()