Get unique values in a Swift array

Get unique values in a Swift array

Recently I was working on an IOS app in Swift language. I came through an issue that I was having an array. That array was filled with values on run time. Most of values were duplicate. So I need to get a unique array. In Swift I did not find  a function to get  unique values. After some Google search I found a same type of question on Stackoverflow and the answer was the solution to my problem.

func uniq<S: SequenceType, E: Hashable where E==S.Generator.Element>(source: S) -> [E] {
    var seen: [E:Bool] = [:]
    return filter(source) { seen.updateValue(true, forKey: $0) == nil }
}

let a = ["four","one", "two", "one", "three","four", "four"]
uniq(a) // ["four", "one", "two", "three"]

Unique values of array in swift