【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
}      

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

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

0x01 我的小作品