How to implement a Stack and a Queue in JavaScript?

How to implement a Stack and a Queue in JavaScript?

You can use JS arrays to stimulate the functionality of stack and queue using pop, unshift, shift, and push methods but it’ll not result in optimized time complexity.
If you want to get stack and queues with the ideal time complexities then you can either create your own classes using JS arrays/objects or can use some already built library like the following: