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* Retranslate the complete English edition from Simplified Chinese * Polish three English explanations after reader-focused review
45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
/**
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* File: deque.js
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* Created Time: 2023-01-17
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* Driver code */
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/* Initialize the deque */
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// JavaScript has no built-in deque; use an Array as a deque
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const deque = [];
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/* Enqueue elements */
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deque.push(2);
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deque.push(5);
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deque.push(4);
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// Note: because this uses an array, unshift() has O(n) time complexity
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deque.unshift(3);
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deque.unshift(1);
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console.log('Deque deque = ', deque);
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/* Access an element */
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const peekFirst = deque[0];
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console.log('Front element peekFirst = ' + peekFirst);
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const peekLast = deque[deque.length - 1];
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console.log('Rear element peekLast = ' + peekLast);
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/* Dequeue an element */
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// Note: because this uses an array, shift() has O(n) time complexity
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const popFront = deque.shift();
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console.log(
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'Element removed from the front, popFront = ' + popFront + ', after dequeuing from the front, deque = ' + deque
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);
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const popBack = deque.pop();
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console.log(
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'Element removed from the rear, popBack = ' + popBack + ', after dequeuing from the rear, deque = ' + deque
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);
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/* Get the deque size */
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const size = deque.length;
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console.log('Deque size = ' + size);
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/* Check whether the deque is empty */
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const isEmpty = size === 0;
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console.log('Is the deque empty = ' + isEmpty);
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