【Swift 60秒】39 - Returning values

0x00 Lesson

As well as receiving data, functions can also send back data. To do this, write a dash then a right angle bracket after your function’s parameter list, then tell Swift what kind of data will be returned.

Inside your function, you use the return keyword to send a value back if you have one. Your function then immediately exits, sending back that value - no other code from that function will be run.

We could rewrite our square() function to return a value rather than print it directly:

func square(number: Int) -> Int {
	return number * number
}
1
2
3

Now we can grab that return value when the function is run, and print it there:

let result = square(number: 8)
print(result)
1
2

If you need to return multiple values, this is a perfect example of when to use tuples.

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