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🧠 JavaScript Mastery · dokhacgiakhoa | DecimalAI

codingby dokhacgiakhoa

🧠 JavaScript Mastery

dokhacgiakhoa/javascript-mastery

Source dokhacgiakhoa/agent-skills-4-vibe-coding-cli ↗License NOASSERTION

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.

SkillScore100Maintained

Automatic

Coding pack

Last verified 8/29/2026

What it changes

Passed 25 of 25 test cases with the skill, and 24 of 25 without it.

Without skill96%

With skill100%

Checks it passed that the model alone missed

Explains that Promise.all rejects immediately upon the first failure

1 fixed24 passed either way0 still failing0 broke

Pass-rate lift: +4 pp
Tokens: +53%
Agent turns: 0%
Response time: +0%

Model gemini-3.6-flashMeasured 8/29/2026v125 of 25 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/dokhacgiakhoa-javascript-mastery/SKILL.md https://app.decimal.ai/s/dokhacgiakhoa-javascript-mastery/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add dokhacgiakhoa-javascript-mastery, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/dokhacgiakhoa-javascript-mastery/ and pins it in .decimal/skills.lock

decimalai skills add dokhacgiakhoa-javascript-mastery

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/dokhacgiakhoa-javascript-mastery/SKILL.md https://app.decimal.ai/s/dokhacgiakhoa-javascript-mastery/SKILL.md

Raw file: /s/dokhacgiakhoa-javascript-mastery/SKILL.md ↗ · machine-readable summary at /s/dokhacgiakhoa-javascript-mastery.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

A test case the skill fixed. Same model, same prompt, with and without the skill.

Prompt

You need to execute three asynchronous operations concurrently in JavaScript. If one operation fails, you still want to collect the full status and values or rejection reasons for all three operations without triggering an unhandled rejection error. Which native Promise static method should be used?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends using Promise.allSettled	Passed	Passed
Explains that Promise.all rejects immediately upon the first failure	Missed	Passed

case-12 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md43 linessingle file

🧠 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

Track record

Benchmark

25 / 25

test cases passed, vs 24 / 25 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/10/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

dokhacgiakhoa / agent-skills-4-vibe-coding-cli

.agent/skills/javascript-mastery/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 8/10/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

davila7/javascript-masteryComprehensive 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.Near-identical description+5 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

🧠 JavaScript Mastery

When to Use This Skill

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

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills