JavaScript Tutorial--Implementation of Linked List Data Structure

Linked list is a common basic data structure. It is a linear list, but it does not store data in linear order. Instead, it stores a pointer to the next node in each node. ). Below we use JavaScript code to implement the data structure of the linked list

The linked list (Linked list) is a common basic data structure and a linear table, but it does not store data in a linear order. It is a pointer (Pointer) stored in each node to the next node - Wikipedia

The above is Wikipedia's interpretation of the linked list. Below we use JavaScript code to implement the data structure of the linked list

Implement the Node class to represent the node

/**
 * Node 类用来表示节点
 * element 用来保存节点上的数据
 * next 用来保存指向下一个节点的链接
 */
function Node(element) {
 this.element = element;
 this.next = null;
}
LList类提供对链表操作的方法
/**
 * LList 类提供了对链表进行操作的方法
 * 链表只有一个属性，
 * 使用一个 Node 对象来保存该链表的头节点。
 */
class LList {
 constructor() {
  this.head = new Node('head');
 }
 // 查找节点
 find(item) {
  let currNode = this.head;
  while(currNode.element !== item) {
   currNode = currNode.next;
  }
  return currNode;
 }
 // 查找前一个节点
 findPre(item) {
  if(item === 'head') throw new Error('now is head!');
  let currNode = this.head;
  while (currNode.next && currNode.next.element !== item) {
   currNode = currNode.next;
  }
  return currNode;
 }
 // 插入新节点
 insert(newElement, item) {
  let newNode = new Node(newElement);
  let currNode = this.find(item);
  newNode.next = currNode.next;
  currNode.next = newNode;
 }
 // 删除一个节点
 remove(item) {
  let preNode = this.findPre(item);
  if(preNode.next !== null) {
   preNode.next = preNode.next.next;
  }
 }
 // 显示链表中的元素
 display() {
  let currNode = this.head;
  while(currNode.next !== null) {
   console.log(currNode.next.element);
   currNode = currNode.next;
  }
 }
}

Test code

const list = new LList(); 
// LList { head: Node { element: 'head', next: null } }
list.insert('0', 'head');
list.insert('1', '0');
list.insert('2', '1');
list.insert('3', '2');
list.remove('1');
console.log(list); 
// LList { head: Node { element: 'head', next: Node { element: '0', next: [Object] } } }
console.log(list.display()); // 0 2 3
console.log(list.findPre('1')); 
// Node { element: '0', next: Node { element: '1', next: Node { element: '2', next: [Object] } } }

The above is a simple implementation of the data structure of a simple linked list using JavaScript: smile:

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