javascript-mastery
✓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.
Installation
SKILL.md
33+ essential JavaScript concepts every developer should know, inspired by 33-js-concepts.
Falsy values (8 total): false, 0, -0, 0n, "", null, undefined, NaN
Rule: Always use === unless you have a specific reason not to.
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. Source: poletron/custom-rules.
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/poletron/custom-rules --skill javascript-mastery- Source
- poletron/custom-rules
- Category
- </>Dev Tools
- Verified
- ✓
- First Seen
- 2026-02-01
- Updated
- 2026-02-18
Quick answers
What is javascript-mastery?
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. Source: poletron/custom-rules.
How do I install javascript-mastery?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/poletron/custom-rules --skill javascript-mastery Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor
Where is the source repository?
https://github.com/poletron/custom-rules
Details
- Category
- </>Dev Tools
- Source
- skills.sh
- First Seen
- 2026-02-01