/Swift/Swift remove all duplicates from an array

Swift remove all duplicates from an array

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

func foobar() {
    let myUniqueArray = [1,2,4,2,1].uniqued()  // => [1,2,4]
}

Source: stackoverflow.com

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