Return: Quiz I in Swift in Swift

Quiz: What would this code produce if we were to copy-paste it in a code editor and run it?

func getDouble(_ n: Int) -> Int {
	let doubled = n * 2
}

func mainFunction() {
	let result = getDouble(10)
	print(result)
}

Important Note:

Do not use an actual code editor to get the answer! It would defy the whole purpose of the quiz!