Queue_by_array

Queue_by_array.swift

public struct Queue<T> {
    internal var data = Array<T>()
    public init() {}
    
    public mutating func dequeue() -> T? {
        return data.removeFirst()
    }
    
    public func peek() -> T? {
        return data.first
    }
    
    public mutating func enqueue(element: T) {
        data.append(element)
    }
    
    public mutating func clear() {
        data.removeAll()
    }
    
    public var count: Int {
        return data.count
    }
    
    public var capacity: Int {
        get {
            return data.capacity
        }
        set {
            data.reserveCapacity(newValue)
        }
    }
    
    public func isFull() -> Bool {
        return count == data.capacity
    }
    
    public func isEmpty() -> Bool {
        return data.isEmpty
    }
}
extension Queue: CustomStringConvertible {
    public var description: String {
        return data.description
    }
}
var myQueue = Queue<Int>()

for i in 1 ... 5 {
    myQueue.enqueue(element: i)
}
print(myQueue.description)