inout
means that modifying the local variable will also modify the passed-in parameters. Without it, the passed-in parameters will remain the same value. Trying to think of reference type when you are using inout
and value type without using it.
For example:
import UIKit
var num1: Int = 1
var char1: Character = "a"
func changeNumber(var num: Int) {
num = 2
print(num) // 2
print(num1) // 1
}
changeNumber(num1)
func changeChar(inout char: Character) {
char = "b"
print(char) // b
print(char1) // b
}
changeChar(&char1)