Swift

6.2    Optional Binding

In Swift, optional bindings enable you to safely unwrap an optional value using a condition. In this common technique, if the optional contains a value, then the code in the condition is executed; otherwise, it is not. Optional bindings are typically used in conjunction with if and guard statements.

Listing 6.10 features a simple demonstration using an if condition. Note that midName is an optional.

var name: Stringvar midName: String?var surname: String// No mid namename = "John"surname = "Doe"if let mNam = midName {    print("\(name) \(mNam) \(surname)")} else {    print("\(name) \(surname)")}  

Listing 6.10     Optional Binding with if Statement

The if statement is where the magic happens. if let mNam = midName means