Swift

4.3    Control Transfer Statements

In this section, you’ll learn about control transfer statements, which are used to manipulate the natural flow of a code block, such as in the following ways:

• Exiting the block earlier than anticipated

• Skipping an iteration

• Enforcing an iteration

• Raising an error

• Performing initial condition checks for execution enablement

Now, let’s go over the keywords that lead to such control transfer statements and implement corresponding code examples.

4.3.1    Break

In Swift, the break keyword is used to exit a loop early, before it naturally finishes. To see this command in a familiar context, Listing 4.42 demonstrates the former login example—with a small enhancement.

let correctPassword = "abcde"var