队列Queue --- Javascript实现

队列（Queue）

先进先出

队列实现

class QueueNode
{
    constructor (data) 
    {
        this.data = data
        this.next = false
    }
    getData = () => this.data
    setData = data => this.data = data
    getNext = () => this.next
    setNext = next => this.next = next
}

class Queue
{
    constructor () 
    {
        this.head = false
        this.tail = false
    }
    empty ()
    {
        return this.head === false
    }
    push (data) 
    {
        let temp = new QueueNode(data)
        if (!this.head) 
        {
            this.head = this.tail = temp
        }
        else
        {
            this.tail.setNext(temp)
            this.tail = temp
        }
    }
    pop () 
    {
        if (this.empty()) return false
        let data = this.head
        this.head = this.head.getNext()
        return data.getData()
    }
    Visit ()
    {
        let p = this.head
        let str = ''
        while (p)
        {
            str += `${p.getData()} `
            p = p.getNext()
        }
        console.log(str)
    }
    clear ()
    {
        this.head = this.tail = false
    }
}

module.exports = { Queue }