ahmad-ubaidillah/javascript-mastery
aizen-gate/skills-reference/.agent/skills/javascript-mastery/SKILL.md
Comprehensive JavaScript reference covering 33+ essential concepts every developer should know. From fundamentals like primitives and closures to advanced patterns like async/await and functional programming. Use when explaining JS concepts, debugging JavaScript issues, or teaching JavaScript fundamentals.
development
Updated Mar 27, 2026
$ install --global
skillsauthnpx skillsauth add ahmad-ubaidillah/aizen-gate javascript-masteryInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Mar 30, 2026, 9:38 AM61.8s24 files scanned
SKILL.md
- version:
- 4.1.0-fractal
- name:
- javascript-mastery
- description:
- Comprehensive JavaScript reference covering 33+ essential concepts every developer should know. From fundamentals like primitives and closures to advanced patterns like async/await and functional programming. Use when explaining JS concepts, debugging JavaScript issues, or teaching JavaScript fundamentals.
🧠 JavaScript Mastery
33+ essential JavaScript concepts every developer should know, inspired by 33-js-concepts.
When to Use This Skill
Use this skill when:
- Explaining JavaScript concepts
- Debugging tricky JS behavior
- Teaching JavaScript fundamentals
- Reviewing code for JS best practices
- Understanding language quirks
1. Fundamentals
🧠 Knowledge Modules (Fractal Skills)
1. 1.1 Primitive Types
2. 1.2 Type Coercion
3. 1.3 Equality Operators
4. 2.1 Scope Types
5. 2.2 Closures
6. 2.3 var vs let vs const
7. 3.1 Call Stack
8. 3.2 Hoisting
9. 3.3 this Keyword
10. 4.1 Event Loop
11. 4.2 Callbacks
12. 4.3 Promises
13. 4.4 async/await
14. 5.1 Higher-Order Functions
15. 5.2 Pure Functions
16. 5.3 map, filter, reduce
17. 5.4 Currying & Composition
18. 6.1 Prototypal Inheritance
19. 6.2 Object Methods
20. 7.1 Destructuring
21. 7.2 Spread & Rest
22. 7.3 Modules
23. 7.4 Optional Chaining & Nullish Coalescing
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