JavaScript Algorithms and Data Structures

This course teaches you how to write JavaScript that solves real problems. You start with core algorithms — sorting, searching, and recursion — and then build the data structures that hold information: arrays, objects, stacks, queues, linked lists, trees, and graphs. Each section pairs a concept with a hands-on coding challenge so you practice writing the logic yourself rather than just watching.

The course runs on the freeCodeCamp platform and is designed for beginners. It assumes no prior programming experience, so you start with the very basics of JavaScript syntax before moving into the algorithmic thinking that separates junior developers from people who can only follow tutorials. The entire course is free, and you can pause at any time since it is self-paced.

By the end, you will be able to implement a binary search on a sorted list, reverse a linked list, and traverse a binary tree. You will also understand big-O notation so you can talk about performance in technical interviews. The course does not cover backend frameworks, mobile development, or visual graphics — if you want to build websites or apps, the later freeCodeCamp courses on responsive web design or data visualization are the natural next step.

Free options include the freeCodeCamp JavaScript Algorithms and Data Structures course and the freeCodeCamp Responsive Web Design course. Paid alternatives start at ₹549 for a 22-hour Udemy course such as Modern JavaScript From The Beginning, or ₹599 for a 69-hour comprehensive course such as The Complete JavaScript Course 2026 From Zero to Expert. Both of those include a certificate and are self-paced.

This course is best if you are comfortable with the idea of writing code without immediate visual feedback and want to strengthen your problem-solving muscles. If you prefer to build something that looks like a website right away, start with the freeCodeCamp Responsive Web Design course instead.