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/**
* File: deque.js
* Created Time: 2023-01-17
* Author: Zhuo Qinyue (1403450829@qq.com)
*/
/* Driver Code */
/* 初始化双向队列 */
// JavaScript 没有内置的双端队列，只能把 Array 当作双端队列来使用
const deque = [ ] ;
/* 元素入队 */
deque . push ( 2 ) ;
deque . push ( 5 ) ;
deque . push ( 4 ) ;
// 请注意， ，
deque . unshift ( 3 ) ;
deque . unshift ( 1 ) ;
console . log ( '双向队列 deque = ' , deque ) ;
/* 访问元素 */
const peekFirst = deque [ 0 ] ;
console . log ( '队首元素 peekFirst = ' + peekFirst ) ;
const peekLast = deque [ deque . length - 1 ] ;
console . log ( '队尾元素 peekLast = ' + peekLast ) ;
/* 元素出队 */
// 请注意， ，
const popFront = deque . shift ( ) ;
console . log (
'队首出队元素 popFront = ' + popFront + '，队首出队后 deque = ' + deque
) ;
const popBack = deque . pop ( ) ;
console . log (
'队尾出队元素 popBack = ' + popBack + '，队尾出队后 deque = ' + deque
) ;
/* 获取双向队列的长度 */
const size = deque . length ;
console . log ( '双向队列长度 size = ' + size ) ;
/* 判断双向队列是否为空 */
const isEmpty = size === 0 ;
console . log ( '双向队列是否为空 = ' + isEmpty ) ;
