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
}

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

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

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

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