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var costume: String? = "Werewolf"
println(costume) // Optional("Werewolf")
costume = costume + " dressed as Michael J Fox" // Compiler Error
if let something = costume {
// The value is not nil, use it with confidence
something = something + " dressed as Michael J Fox"
println(something) // "Werewolf dressed as Michael J Fox"
} else {
// The value is nil
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