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    If Element is Equatable, you can just use !contains(element)
    – Alexander
    Commented Oct 2, 2017 at 3:30
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    Oh wow, @discardableResult, Equatable, Element, I'm learning so much things in just one post! I've been thinking about how to make a result discardable so I don't need to use _ = ... but didn't know that such thing exists so I never look it up. Thanks!!! Commented Oct 2, 2017 at 3:34