Swift 1.2 introduced a new
Set type that works similarly to
NSSet except with value semantics. Sets work similarly to arrays except they are not ordered and do not store any element more than once. For example:
var starships = Set<String>() starships.insert("Serenity") starships.insert("Enterprise") starships.insert("Executor") starships.insert("Serenity") starships.insert("Serenity")
Even though that code tries to insert Serenity three times, it will only be stored in the set once.
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