225.用队列实现栈.ts

/*
 * @lc app=leetcode.cn id=225 lang=typescript
 *
 * [225] 用队列实现栈
 */

// @lc code=start

// 啊？这不纯用数组原生方法吗 🤨
class MyStack {
  protected stack: number[] = []

  constructor() {
    this.stack = []
  }

  push(x: number): void {
    this.stack.push(x)
  }

  pop(): number {
    return this.stack.pop() ?? 0
  }

  top(): number {
    return this.stack[this.stack.length - 1]
  }

  empty(): boolean {
    return this.stack.length === 0
  }
}

/**
 * Your MyStack object will be instantiated and called as such:
 * var obj = new MyStack()
 * obj.push(x)
 * var param_2 = obj.pop()
 * var param_3 = obj.top()
 * var param_4 = obj.empty()
 */

// @lc code=end