JavaScript: What are Stack and Queue?

Summary

The provided web content discusses the implementation of two fundamental data structures, stacks and queues, in JavaScript, detailing their LIFO and FIFO mechanisms, respectively, and offering code examples using arrays and linked lists.

Abstract

The article delves into the concepts of stacks and queues, which are essential data structures in computer science. It explains that stacks operate on a Last In, First Out (LIFO) principle, using the analogy of a stack of plates to illustrate how elements are added and removed from the top. The author provides JavaScript implementation examples for stacks using both arrays and linked lists, including methods such as push, pop, and peek. Similarly, for queues, which follow a First In, First Out (FIFO) order, the article uses the example of a line of people at a fast food restaurant to clarify the concept. The JavaScript implementations for queues are also demonstrated with arrays and linked lists, showcasing methods like enqueue, dequeue, and peek. The article concludes by inviting readers to explore more JavaScript content through the author's profile.

Opinions

The author suggests that understanding stacks and queues is crucial for technical interviews and educational courses.
Real-life analogies, such as a stack of plates and a line at a fast food restaurant, are used to make the concepts more relatable and understandable.
The article emphasizes the importance of practical implementation by providing code examples for both stacks and queues using two different data structures: arrays and linked lists.
The author encourages further learning by directing readers to additional JavaScript resources and related articles on topics like variables, data types, prototypal inheritance, ES6 features, and merge sort algorithm.

What is a Stack?

A stack is a type of data structure that is linear where order is conserved. For many people, stack is known to have a LIFO (Last In First Out) mechanism. Let’s take a look at an example of a stack in real life: stack of plates.

If you weren’t allow to take plates from the middle and all you can only see the top most plate, this is a stack!

Now that we know how a stack works, let’s implement it in JavaScript! In our implementation we will write the basic methods for a stack like push, pop, and peek.

What is a Queue?

Similar to a stack, queue is a linear data structure where it obeys the FIFO (First In First Out) mechanism. You can think of a queue as a single line of people at a fast food restaurants.

Given that no one cuts anyone, first person on the line will get to order the food first and the last person will be the last one to order. This is an example of a queue!

Now that we know how a queue works, let’s implement it in JavaScript! In our implementation we will write the basic methods for a queue like enqueue, dequeue, and peek.

JavaScript: What are Stack and Queue?

What is a Stack?

Implementation #1 (Array)

Implementation #2 (Linked List)

What is a Queue?

Implementation #1 (Array)

Implementation #2 (Linked List)

Basics of JavaScript:

JavaScript Fundamentals

ES6

Merge Sort