由于这里只需要栈的 push () 与 pop () 两个操作，直接用 JavaScript 数组模拟即可，无需引入自定义栈类。 如果你希望系统性地了解栈及其在 JavaScript 中的经典实现，可以参考仓库中的 Stack 数据结构一文 ——它同样位于本仓库，详细讲解了 push 、 pop 、 peek 、 isEmpty 四个基本操作的实现原理。
一、什么是函数元数？ 函数元数（arity）是 函数期望接收的参数个数。在 JavaScript 中，这个概念听起来很理论化，但在实际编程中非常有用，尤其是在函数式编程领域。
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