extension Array{
    func every(fn: (T)->Bool) -> Bool{
        var out = true
        for i in self {
            out = out && fn(i);
        }
        return out
    }
    func some(fn: (T) -> Bool) -> Bool{
        var out = false
        for i in self {
            out = out || fn(i);
        }
        return out
    }
}