iOS Programming: The Big Nerd Ranch Guide, 6th Edition

Loops and String Interpolation

Swift has all the control flow statements that you may be familiar with from other languages: if-else, while, for, for-in, repeat-while, and switch. Even if they are familiar, however, there may be some differences from what you are accustomed to. The key difference between these statements in Swift and in C-like languages is that while enclosing parentheses are not necessary on these statements’ expressions, Swift does require braces on clauses. Additionally, the expressions for if and while-like statements must evaluate to a Bool.

Swift does not have the traditional C-style for loop that you might be accustomed to. Instead, you can accomplish the same thing a little more cleanly using Swift’s ...