Unique values of array in swift [duplicate]

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There might be a more efficient way, but an extension would probably be most straightforward:

extension Array where Element: Equatable {
    var unique: [Element] {
        var uniqueValues: [Element] = []
        forEach { item in
            guard !uniqueValues.contains(item) else { return }
            uniqueValues.append(item)
        }
        return uniqueValues
    }
}

If order doesn’t matter and objects are also hashable:

let array = ["one", "one", "two", "two", "three", "three"]
// order NOT guaranteed
let unique = Array(Set(array))
// ["three", "one", "two"]

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