Queues and Circular Queues Data Structures in JavaScript

In this tutorial we'll go ahead and talk about how we can go about implementing a queue. A queue is a data structure that can be implemented using an array or a linked list. Within this video we'll be implementing our queue using an array. We'll be going over the flaws of implementing a queue and how we can solve these problems by implementing a circular queue.

[wasd]

is there a reason in javascript to have a fixed capacity array? going into this previously watching a quick vid what circular queue is from c++'s viewpoint, I figured it's a thing for low level programming where you have to work with such data structures, but in javascript doesn't the engine do all of it by itself if you just use a normal array?