JavaScript Algorithms and Data Structures

This course builds a foundation in JavaScript by walking through core algorithms and the data structures that hold them. You start with basic syntax and move into ES6 features, regular expressions for pattern matching, and the data structures that store and organise information — arrays, objects, linked lists, stacks, queues, and hash maps. Each section pairs a concept with a practical use: sorting arrays, searching with regular expressions, managing state with objects, and implementing common algorithms like binary search and recursion.

The course takes a hands-on approach. Every concept is followed by interactive challenges on the freeCodeCamp platform. You write code, run it instantly, and see the result without leaving the page. The modules progress from basic data types to object-oriented programming and functional programming, ending with a final project that ties the topics together.

By the end, you can manipulate data structures to solve real problems. You will be able to filter and map arrays, validate input with regular expressions, build simple object-based models, and trace the steps of a sorting algorithm. These are the skills a junior developer needs for technical interviews and everyday scripting tasks.

This course is free, self-paced, and designed for beginners. It requires no prior programming experience, only a browser and the willingness to type code. Learners who want more depth in a particular topic — such as dynamic programming or advanced data structures — can supplement with the other JavaScript courses listed on the site, including paid options on Udemy that offer longer durations and certificates for a fee.

Free options include this freeCodeCamp course and the many other free JavaScript courses listed on the site, which cover syntax, DOM manipulation, and Node.js basics at no cost.