Stack and Queue with JavaScript

class Stack {
  constructor() {
    this.items = [];
  }
  pop() {
    return this.items.pop();
  }
  push(data) {
    this.items.push(data);
  }
  getTop() {
    return this.items.length > 0 ? this.items[this.items.length - 1] : '';
  }
  isEmpty() {
    return this.items.length == 0;
  }
}

class Queue {
  constructor() {
    this.items = [];
  }
  // 入队
  enQueue(data) {
    this.items.push(data);
  }
  // 出队
  deQueue() {
    this.items.shift();
  }
  isEmpty() {
    return this.items.length == 0;
  }
}

let stack = new Stack();

stack.push(1);
stack.push(2);
stack.push(3);
stack.push(4);
stack.pop();
stack.push(5);
console.log('stack',stack.items);

let queue = new Queue();

queue.enQueue(1);
queue.enQueue(2);
queue.enQueue(3);
queue.enQueue(4);
queue.deQueue();
queue.enQueue(5);

console.log('queue',queue.items);