JavaScript实现双向链表
2024-08-22 20:55:17
title: JavaScript实现双向链表
toc: false
date: 2018-10-07 10:11:36
- append(element): 添加元素到链表尾部
- insert(position,element): 向双向链表中某个位置插入元素
- removeAt(position): 移除双向链表中某个位置的元素
- getHead(): 获取双向链表的头部
- getTail(): 获取双向链表的尾部
- isEmpty(): 检查双向链表是否为空，为空则返回true
- size(): 返回双向链表长度
function DoublyLinkedList() {
var Node = function (element) {
this.element = element;
this.next = null;
this.prev = null;
}
var length = 0;
var head = null;
var tail = null;
this.append = function (element) {
var node = new Node(element);
if (head === null) {
head = node
tail = node
} else {
tail.next = node;
node.prev = tail;
tail = node;
}
length++;
return true;
}
/**
* 向双向链表中某个位置插入元素
*
* @param {any} position 要插入的位置
* @param {any} element 要插入的元素
* @returns 插入成功或失败
*/
this.insert = function (position, element) {
var node = new Node(element),
current = head,
previous,
index = 0;
if (position < 0 && position > length) {
return false;
}
if (position === 0) {
node.next = head
head.prev = node
head = node
} else if (position === length) {
tail.next = node;
node.prev = tail;
tail = node;
} else {
while (index++ < position) {
previous = current
current = current.next;
}
previous.next = node;
node.prev = previous;
node.next = current;
current.prev = node;
}
length++;
return true;
}
/**
* 移除双向链表中某个位置的元素
*
* @param {any} position 要移除元素的位置
* @returns 移除成功，返回移除的元素
*/
this.removeAt = function (position) {
var previous,
current = head,
index = 0;
if (position < 0 && position >= length) {
return false;
}
if (position === 0) {
head = current.next;
head.prev = null;
} else if(position === length - 1) {
current = tail;
tail = current.prev;
tail.next = null;
} else {
while (index++ < position) {
previous = current
current = current.next;
}
previous.next = current.next;
current.next.prev = previous;
}
length--;
return current.element;
}
this.getHead = function () {
return head.element;
}
this.isEmpty = function () {
return length === 0
}
this.getTail = function () {
return tail.element;
}
this.size = function () {
return length
}
}
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