![[missing "en.views.course_landing_page.linear-data-structures.course_illustration" translation]](http://www.codecademy.com/webpack/b7c31c2fb065ba5cd0be243025bcb33a.svg)
Key Concepts
Review core concepts you need to learn to master this subject
Queue follows FIFO protocol
Queue follows FIFO protocol
A queue is a data structure composed of nodes, which follows a first in, first out (FIFO) protocol.
This is analogous to a line at a grocery store, for which the first customer in the queue is the first to checkout.
Queue data structure methods
Queue data structure methods
The queue data structure has three main methods:
enqueue(adds a node to the back of the queue)dequeue(removes node at the front of the queue)peek(returns value of node at the front of the queue, without removing it)
- 1
A queue is a data structure which contains an ordered set of data. Queues provide three methods for interaction: - Enqueue - adds data to the “back” or end of the queue - Dequeue - provides and re…
- 2
Queues can be implemented using a linked list as the underlying data structure. The front of the queue is equivalent to the head node of a linked list and the back of the queue is equivalent to th…
- 3
Let’s take a minute to review what we’ve covered about queues in this lesson. Queues: - Contain data nodes - Support three main operations: - Enqueue adds data to the back of the queue - Dequeue…
- 1
As previously mentioned, a queue is a data structure that contains an ordered set of data that follows a FIFO (first in, first out) protocol. You can visualize it as a line at a deli: - The custome…
- 2
Bounded queues require limits on the number of nodes that can be contained, while other queues don’t. To account for this, we will need to make some modifications to our […] class so that we c…
- 3
“Enqueue” is a fancy way of saying “add to a queue,” and that is exactly what we’re doing with the […] method.
There are three scenarios that we are concerned with when adding a node to the q…
- 4
We can add items to the tail of our queue, but we remove them from the head using a method known as […] , which is another way to say “remove from a queue”. Like […] , we care about the size …
- 5
Congrats! You have just implemented a queue data structure in Python by creating a […] class that: - follows FIFO protocol with […] , […] , and […] methods - gives you the option of …
How you'll master it
Stress-test your knowledge with quizzes that help commit syntax to memory
