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/**
* File: deque.js
* Created Time: 2023-01-17
* Author: Zhuo Qinyue (1403450829@qq.com)
*/
/* Driver Code */
/* 初始化雙向佇列 */
// JavaScript 沒有內建的雙端佇列，只能把 Array 當作雙端佇列來使用
const deque = [ ] ;
/* 元素入列 */
deque . push ( 2 ) ;
deque . push ( 5 ) ;
deque . push ( 4 ) ;
// 請注意， ，
deque . unshift ( 3 ) ;
deque . unshift ( 1 ) ;
console . log ( '雙向佇列 deque = ' , deque ) ;
/* 訪問元素 */
const peekFirst = deque [ 0 ] ;
console . log ( '佇列首元素 peekFirst = ' + peekFirst ) ;
const peekLast = deque [ deque . length - 1 ] ;
console . log ( '佇列尾元素 peekLast = ' + peekLast ) ;
/* 元素出列 */
// 請注意， ，
const popFront = deque . shift ( ) ;
console . log (
'佇列首出列元素 popFront = ' + popFront + '，佇列首出列後 deque = ' + deque
) ;
const popBack = deque . pop ( ) ;
console . log (
'佇列尾出列元素 popBack = ' + popBack + '，佇列尾出列後 deque = ' + deque
) ;
/* 獲取雙向佇列的長度 */
const size = deque . length ;
console . log ( '雙向佇列長度 size = ' + size ) ;
/* 判斷雙向佇列是否為空 */
const isEmpty = size === 0 ;
console . log ( '雙向佇列是否為空 = ' + isEmpty ) ;
