A stack in JavaScript is a linear data structure that follows the Last-In-First-Out (LIFO) principle, where elements are both added and removed from the top, and can be used for a variety of tasks.

Stacks are data structures that follow the Last-In-First-Out (LIFO) principle, meaning the last item inserted into a stack is the first one to be deleted ...

We’ll want the users of our data structure to be able to determine which value they want, so we’ll modify our inner function to accept an argument that will determine which value to return.