leonardomso/33-js-concepts

📜 33 JavaScript concepts every developer should know.

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leonardomso/33-js-concepts has 66k+ stars and 9k+ forks on GitHub, is written in JavaScript, and was last pushed on Oct 16, 2026. Data as of . Signed-in members get hourly updates — create a free account.

Summary Information

Updated 1 hour ago
Type:Curated List / Learning ResourceCategory(s):Programming Courses & BooksLearning & Resources
Added to GitGenius on August 30th, 2026
Created on September 4th, 2018
Open Issues & Pull Requests: 9 (+0)
GitHub issues: Enabled
Number of forks: 9,119
Total Stargazers: 66,529 (+0)
Total Subscribers: 1,187 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 43.8 hours
Mean response time: 43.0 days
90th percentile: 184.6 days
Tracked items: 43

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Issue Activity (beta)

Open issues: 2
New in 7 days: 0
Closed in 7 days: 0
Avg open age: 25 days
Stale 30+ days: 1
Stale 90+ days: 0

Recent activity

Opened in 7 days: 0
Closed in 7 days: 0
Comments in 7 days: 0
Events in 7 days: 0

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Detailed Description

33 JavaScript Concepts is an educational resource that explains fundamental and advanced JavaScript concepts through written guides and examples.

The project addresses the challenge of understanding JavaScript's core principles by providing structured explanations of concepts that developers encounter regularly but may not fully grasp. It covers topics ranging from primitive types and closures to JavaScript engines and asynchronous programming. The approach organizes these concepts into individual guides that break down how each works, why it matters, and how to use it effectively in practice.

Developers building JavaScript applications across frameworks like React and Angular, or working with Node.js, will find this resource useful for filling knowledge gaps or reinforcing understanding of language fundamentals. The project suits both beginners seeking to build a solid foundation and experienced developers wanting to deepen their comprehension of how JavaScript actually works under the hood. It is particularly valuable for those preparing for technical interviews or transitioning between different JavaScript environments and frameworks.

The project maintains an active community with contributions focused on improving explanations and adding clarifications to existing concepts. Development activity shows consistent engagement with pull requests addressing content quality and accuracy. The resource benefits from ongoing refinement of its educational material, with contributors working to ensure explanations remain clear and technically sound.