javascript-mastery
Learn JavaScript Core Concepts
JavaScript behavior can be difficult to explain when type coercion, scope, async flow, and prototypes interact. This skill gives Claude, Codex, and Claude Code a structured reference for teaching, reviewing, and debugging core JavaScript ideas.
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Copy this request to your Agent. It includes the canonical Skill page and manifest.
Review the Skillstore skill "javascript-mastery" from https://skillstore.io/skills/sickn33-javascript-mastery.md and its manifest at https://skillstore.io/api/skills/sickn33-javascript-mastery/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Agent-readable resources
Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.
Test it
Using "javascript-mastery". Explain why strict equality is usually safer than loose equality.
Expected outcome:
The response explains that loose equality converts values before comparison, which can produce surprising results. It recommends strict equality because it compares both value and type.
Using "javascript-mastery". Help me understand why promise callbacks run before timer callbacks.
Expected outcome:
The response describes synchronous execution first, then microtasks such as promise callbacks, then macrotasks such as timers. It gives a clear final order without running code.
Using "javascript-mastery". Review a small module for modern JavaScript practices.
Expected outcome:
- Flags risky use of var, loose equality, unclear this binding, and avoidable mutation.
- Suggests const or let, strict equality, pure helper functions, and clearer async error handling.
- Explains each recommendation using concepts from the reference.
Security Audit
SafeThe skill is a passive Markdown JavaScript learning reference. The static findings are false positives from code fences, inline Markdown, relative fetch examples, and public documentation links. I found no executable scripts, command execution, credential handling, prompt injection text, or malicious intent.
Risk Factors
⚡ Contains scripts (1)
⚙️ External commands (57)
🌐 Network access (8)
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<iframe src="https://skillstore.io/embed/skills/sickn33-javascript-mastery.html" title="Skillstore Security Assessment" sandbox="allow-popups allow-popups-to-escape-sandbox" loading="lazy" referrerpolicy="no-referrer" width="420" height="180"></iframe>Academic citations (APA · BibTeX · CFF)
APA citation
sickn33. (2026). javascript-mastery security audit report (audit version 4) [Author version unspecified]. Skillstore. https://skillstore.io/skills/sickn33-javascript-mastery/audits/4BibTeX citation
@techreport{sickn33-sickn33-javascript-mastery-2026,
author = {sickn33},
title = {javascript-mastery security audit report (audit version 4)},
institution = {Skillstore},
year = {2026},
number = {4},
url = {https://skillstore.io/skills/sickn33-javascript-mastery/audits/4},
note = {Author version unspecified}
}CITATION.cff
cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "javascript-mastery security audit report (audit version 4)"
version: "unspecified"
type: report
authors:
- name: "sickn33"
date-released: "2026-07-07"
url: "https://skillstore.io/skills/sickn33-javascript-mastery/audits/4"
identifiers:
- type: other
value: "skillstore:sickn33-javascript-mastery:audit:4"
description: "Skillstore immutable audit report identifier"
Skillstore Score
Why this score Evidence Confidence: HighWhat You Can Build
Explain a confusing JavaScript behavior
Use the reference to explain coercion, equality, scope, hoisting, this binding, or async ordering in plain language.
Review code for language-level mistakes
Compare code against guidance on strict equality, closures, variable declarations, pure functions, and object behavior.
Prepare lessons and interview practice
Build explanations, quizzes, and study prompts around core JavaScript concepts from fundamentals through ES6 modules.
Try These Prompts
Explain JavaScript type coercion using simple examples. Include when to prefer strict equality and why.
Walk through this JavaScript async flow step by step. Explain call stack, microtasks, macrotasks, and final output order.
Review this JavaScript for language-level issues involving var, closures, this binding, mutation, equality, and async error handling.
Create a lesson that connects closures, higher-order functions, currying, composition, prototypes, and ES6 modules for experienced developers.
Best Practices
- Ask for a concept explanation before asking for refactoring advice.
- Provide the exact snippet or behavior you want explained.
- Use the quick reference topics to scope lessons and code reviews.
Avoid
- Do not treat simplified examples as production-ready application code.
- Do not ask the skill to execute JavaScript or verify runtime behavior directly.
- Do not use it as a complete substitute for framework, TypeScript, or security documentation.
Frequently Asked Questions
What does this skill help with?
Can it run JavaScript code?
Is it useful for beginners?
Can advanced developers use it?
Does it cover TypeScript or frameworks?
Are the external links required?
Developer Details
Author
sickn33License
MIT
Skillstore revision
r1
Version notice
The author did not declare a version.
Repository
https://github.com/sickn33/antigravity-awesome-skills/tree/main/skills/javascript-masteryRef
816c62b2546ddb1c6a0453e7c781b5e095117819
Maintenance freshness
7/18/2026
Usage
7 downloads · 80 views
File structure
📄 SKILL.md