How to create DispatchGroup

DispatchGroup.swift

let group = DispatchGroup()
group.enter()

let dispatchQueue1 = DispatchQueue.init(label: "dispatchQueue")

dispatchQueue1.sync {
    for i in 0..<5 {
        print("DispatchQueue X ", i)
    }
    group.leave()
}

group.enter()
dispatchQueue1.sync {
    for i in 0..<5 {
        print("DispatchQueue Y ", i)
    }
    group.leave()
}

group.notify(queue: dispatchQueue1){
    print("Dispatch group finished the work")
}