Udemy
50 days of LeetCode - JavaScript Algorithms Coding Interview
50 days of LeetCode - JavaScript Algorithms Coding Interview is a beginner-level online course from Udemy in JavaScript. It is structured in 20 modules with 5 stated learning outcomes. It is free to enrol, and a certificate is available on completion. Learners rate it 4.5/5 from 10 ratings on Udemy, with 159 enrolled.
Part of our JavaScript courses collection, where we compare it against 12 other courses.
Course highlights
| Provider | Udemy |
| Level | Beginner |
| Mode | Self-paced |
| Language | English |
| Certificate | Yes — shareable certificate |
| Rating | 4.5★ (10 reviews) |
| Learners | 159 |
| Price | Free Free |
What you’ll learn
Level and time commitment
Skills you’ll gain
What this course covers
20 modulesThe 20-part outline Udemy publishes for this course.
Module 1 · Microsoft Array Question: Container with most water (Medium)
Module 2 · Google Array Question: Valid mountain array (Easy)
Module 3 · Google Array Question: Boats to save people (Medium)
Module 4 · Facebook Array Question: Move Zeroes (Easy)
Module 5 · Amazon Array Question: Longest substring without repeating characters (Medium)
Module 6 · Arrays Question:Find first and last position of element in sorted Array (Medium)
Module 7 · Google Array question: first bad version (Easy)
Module 8 · Microsoft Math Question: Missing Number (Easy-ish)
Module 9 · Amazon Math Question: Count Primes
Module 10 · Airbnb Math Question: Single Number
Module 11 · Amazon Math Question: Robot return to origin (Easy)
Module 12 · Facebook Math Question: Add Binary (Easy)
Module 13 · Google Hash Tables / Dictionaries question: Two Sum (Easy)
Module 14 · Google Hash Tables / Dictionaries question: Contains Duplicate
Module 15 · Google Hash Tables / Dictionaries question: Majority Element
Module 16 · Facebook Hash Tables / Dictionaries question: Group Anagrams (Medium)
Module 17 · Hash Tables / Dictionaries question: 4sum 2 (Medium)
Module 18 · Microsoft Hash Tables / Dictionaries question: LRU Cache (Medium)
Module 19 · Linkedin Hash Tables / Dictionaries question: Minimum Window Substring (Hard)
Module 20 · Apple Linked list question: Merge Two Sorted Lists (Easy)
What learners rate it
Rated 4.5/5 by 10 learners on Udemy (checked 29 Aug 2026).
This rating is collected by Udemy from its own enrolled learners. We reproduce it as reported and do not accept paid or incentivised reviews. See it on Udemy →
Compiled by the 10courses editorial desk. Fees, ratings, duration and certificate details for the 1 course shown are read directly from Udemy course pages — we never estimate a price or a rating. Last verified 29 August 2026.
How we compare and rank courses · Our review policy · Affiliate disclosure
Compare with alternatives
Same topic, different trade-offs — here's who runs each one and what it's best at.
| Course | Provider | Rating | Price | Duration | Why pick this one |
|---|---|---|---|---|---|
| 50 days of LeetCode - JavaScript Algorithms Coding Interview This |
Udemy
|
4.5★ | Free | Free — certificate included | |
| The Complete JavaScript Course 2026: From Zero to Expert |
Udemy
|
4.7★ | Free | 69 hours | Highest rated (4.7★ from 233.9K reviews) |
| JavaScript Algorithms and Data Structures |
 freeCodeCamp
|
4.7★ | Free | 300 hours | Free — and still gives a certificate |
| Modern JavaScript From The Beginning |
Udemy
|
4.7★ | ₹549 | 22 hours | Cheapest paid option (₹549) |
Where JavaScript leads
Roles we map to JavaScript on 10courses. This is our own mapping of subject to job, not a placement claim by Udemy.
Browse every course we track for one of these — courses for full-stack developers.
Common questions
Is 50 days of LeetCode - JavaScript Algorithms Coding Interview free?
Yes. Udemy lists it as free to enrol. A certificate is available on completion — providers often charge separately for the certificate even when the course itself is free, so check the fee on the provider page before you count on it.
Does 50 days of LeetCode - JavaScript Algorithms Coding Interview come with a certificate?
Yes — Udemy lists a certificate on completion. It is a course certificate, not a formal qualification or university credit.
Is 50 days of LeetCode - JavaScript Algorithms Coding Interview suitable for beginners?
Yes. Udemy lists it at Beginner level, so no prior experience in the subject is assumed.
What does 50 days of LeetCode - JavaScript Algorithms Coding Interview cover?
It is organised into 20 modules, starting with Microsoft Array Question: Container with most water (Medium) and going on to Google Array Question: Valid mountain array (Easy), Google Array Question: Boats to save people (Medium), Facebook Array Question: Move Zeroes (Easy), Amazon Array Question: Longest substring without repeating characters (Medium), among others. The full outline is on this page.