Modern JavaScript from the Beginning - Second Edition - Queues

The video tutorial explains the queue data structure, which operates on a First In First Out (FIFO) basis. It covers the implementation of a queue class in JavaScript, including methods like enqueue, dequeue, peek, and length. The tutorial demonstrates how to add and remove items from the queue, check if it's empty, and view the front item. The video concludes with testing the queue implementation to ensure it functions correctly.

What is the primary characteristic that differentiates a queue from a stack?

• Queues and stacks both follow first-in-first-out.

• Queues are last-in-first-out, while stacks are first-in-first-out.

• Queues and stacks both follow last-in-first-out.

• Queues are first-in-first-out, while stacks are last-in-first-out.

Which method is used to add an item to the queue?

• push

• enqueue

• dequeue

• peek

What does the 'peek' method do in a queue?

• Checks if the queue is empty

• Removes the last item in the queue

• Returns the item at the front of the queue without removing it

• Adds a new item to the queue

In the queue implementation, what is the initial value of the 'count' property?

• undefined

• 0

• 1

• null

What happens to the 'count' property when an item is enqueued?

• It decreases by one

• It remains the same

• It increases by one

• It resets to zero

After enqueuing 'item one', 'item two', and 'item three', what will be the front item?

• None of the above

• item three

• item two

• item one

What will be the queue length after dequeuing once from a queue with three items?

• 1

• 2

• 3

• 0