Removing duplicate elements from an array in Swift

Question

I might have an array that looks like the following:

[1, 4, 2, 2, 6, 24, 15, 2, 60, 15, 6]

Or, reall

Answer 1

Swift 4

public extension Array where Element: Hashable {
    func uniqued() -> [Element] {
        var seen = Set()
        return filter{ seen.insert($0).inserted }
    }
}

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every attempt to insert will also return a tuple: (inserted: Bool, memberAfterInsert: Set.Element). See documentation.

Using the returned value helps us to avoid looping or doing any other operation.