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Remove queue example from playground as implementation was removed.
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Singly Linked List/SinglyLinkedList.playground/Contents.swift

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@@ -725,20 +725,3 @@ assert(l2.contains(67) == true)
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let l3 = l2.dropLast()
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assert(l3.count == 7)
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assert(l3.contains(67) == false)
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//: We can use this class as a queue.
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func empty<Q: Queue>(queue: inout Q) {
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while let _ = queue.dequeue() {}
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}
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var q: SinglyLinkedList<Int> = [5,1,2,3]
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empty(queue: &q)
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assert(q.count == 0)
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try? q.enqueue(item: 1)
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try? q.enqueue(item: 3)
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try? q.enqueue(item: 5)
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assert(q.count == 3)
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