/**
 * 队列
 */
export default class Queue<T> {
  private items: object;
  private count: number;
  private header: number;
  constructor() {
    this.items = {};
    this.count = this.header = 0;
  }

  /**
   * 入队列
   * @param element
   * @returns 当前队列的数量
   */
  enqueue(element: T): number {
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    this.items[this.count++] = element;
    return this.size();
  }

  /**
   * 出队列
   * @returns 出队列的元素
   */
  dequeue(): T | undefined {
    if (this.isEmpty()) return undefined;
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    const res = this.items[this.header];
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    delete this.items[this.header];
    this.header++;
    return res;
  }

  /**
   * 查看队首的元素
   * @return 队首位的元素
   */
  peek(): T | undefined {
    if (this.isEmpty()) return undefined;
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    return this.items[this.header];
  }

  /**
   * 返回队列中元素的个数
   * @returns count
   */
  size(): number {
    return this.count - this.header;
  }

  /**
   * 返回队列是否为空
   * @returns boolean
   */
  isEmpty(): boolean {
    return this.size() === 0;
  }

  /**
   * 清空队列
   */
  clear(): void {
    this.items = {};
    this.header = this.count = 0;
  }

  /**
   * 返回队列元素组成的字符串
   * @returns string
   */
  toString(): string {
    if (this.isEmpty()) return "queue is empty!";
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    let res = this.items[this.header].toString();
    for (let i = this.header + 1; i < this.count; i++) {
      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
      // @ts-ignore
      res = `${res}, ${this.items[i].toString()}`;
    }
    return res;
  }
}

在需要的文件当中使用

const queue = new Queue();
 queue.enqueue("入队一个元素")