export class Stack<T> {
  #list: T[]

  constructor(list: Iterable<T>) {
    this.#list = Array.from(list)
  }

  get size() {
    return this.#list.length
  }

  get top() {
    return this.#list[0] ?? null
  }

  pop() {
    if (this.#list.length === 0) {
      return null
    }
    return this.#list.shift() ?? null
  }
}