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Swift: Optionals Part 2
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| // Declare an optional value | |
| var name: String? = "Roman" | |
| // Optional chaining | |
| name?.characters.count | |
| if name != nil { | |
| // Force unwrap | |
| name!.characters.count | |
| } | |
| // Optional binding | |
| if let unwrappedName = name { | |
| unwrappedName.characters.count | |
| } | |
| // Variable shadowing | |
| if let name = name { | |
| name.characters.count | |
| } |
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