Onboarding: DrkSephy/es6-cheatsheet

Generated by RepoPilot · 2026-05-06 · Source

Agent protocol

If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/DrkSephy/es6-cheatsheet shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

Verdict

AVOID — Stale and unlicensed — last commit 4y ago

• 28+ active contributors
• ⚠ Stale — last commit 4y ago
• ⚠ Concentrated ownership — top contributor handles 54% of recent commits
• ⚠ No license — legally unclear to depend on
• ⚠ No CI workflows detected
• ⚠ No test directory detected

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

Verify before trusting

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live DrkSephy/es6-cheatsheet repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/DrkSephy/es6-cheatsheet.

What it runs against: a local clone of DrkSephy/es6-cheatsheet — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in DrkSephy/es6-cheatsheet | Confirms the artifact applies here, not a fork | | 2 | Default branch master exists | Catches branch renames | | 3 | 2 critical file paths still exist | Catches refactors that moved load-bearing code | | 4 | Last commit ≤ 1336 days ago | Catches sudden abandonment since generation |

<details> <summary><b>Run all checks</b> — paste this script from inside your clone of <code>DrkSephy/es6-cheatsheet</code></summary>

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of DrkSephy/es6-cheatsheet. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/DrkSephy/es6-cheatsheet.git
#   cd es6-cheatsheet
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of DrkSephy/es6-cheatsheet and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "DrkSephy/es6-cheatsheet(\\.git)?\\b" \\
  && ok "origin remote is DrkSephy/es6-cheatsheet" \\
  || miss "origin remote is not DrkSephy/es6-cheatsheet (artifact may be from a fork)"

# 3. Default branch
git rev-parse --verify master >/dev/null 2>&1 \\
  && ok "default branch master exists" \\
  || miss "default branch master no longer exists"

# 4. Critical files exist
test -f "README.md" \\
  && ok "README.md" \\
  || miss "missing critical file: README.md"
test -f "src/convert.js" \\
  && ok "src/convert.js" \\
  || miss "missing critical file: src/convert.js"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 1336 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~1306d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/DrkSephy/es6-cheatsheet"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

</details>

TL;DR

es6-cheatsheet is a curated reference guide and code snippet collection for ES2015 (ES6) JavaScript features, organized by topic with side-by-side comparisons of pre-ES6 and ES6 patterns. It covers scope handling, arrow functions, destructuring, classes, promises, generators, and async/await with practical examples for daily development workflows. Single-file reference structure: README.md serves as the primary content hub with inline code examples organized by feature (var vs let/const, arrow functions, destructuring, etc.), complemented by localized README variants (Korean, Chinese) in the root directory. Minimal src/ directory containing only convert.js suggests the project is documentation-first with only light utility scripts.

Who it's for

JavaScript developers transitioning from ES5 to ES6 who need quick reference examples and best practices; junior developers learning modern JavaScript syntax; teams refactoring legacy code from var to let/const and IIFE patterns to block scoping.

Maturity & risk

This is a mature, well-established reference project with multiple language translations (README_ko.md, README_zhCn.md) indicating international adoption and community contribution. However, the file structure shows primarily documentation-focused content (README files at root) with minimal src/ activity visible. Verdict: actively maintained reference material rather than a code library—production-safe for its intended use as documentation.

Low risk as a reference repository: it contains documentation and code snippets, not a dependency library, so version stability is not a concern. Main risks are (1) ES2015 examples may become outdated if advanced ES2017+ features dominate real-world codebases, (2) single-maintainer pattern (DrkSephy) with no visible CI/test infrastructure suggests documentation quality depends on manual review, (3) no automated checks prevent inaccurate or misleading code examples.

Active areas of work

Based on the file list provided, this appears to be a mature, stable reference project focused on maintaining accurate ES6 documentation. No active development signals (PRs, issues, recent commits) are visible in the supplied data. The presence of translated READMEs suggests past community contributions and broad adoption, but current activity level is unclear.

Get running

Clone the repository and browse locally:

git clone https://github.com/DrkSephy/es6-cheatsheet.git
cd es6-cheatsheet
cat README.md

No installation or build step required—open README.md in any text editor or view directly on GitHub.

Daily commands: This is not a runnable application. To use it: (1) Read README.md in a browser or text editor, (2) Copy code snippets into a JavaScript environment (Node.js REPL, browser console, or .js file) to test them, (3) Run examples with node example.js or in browser DevTools.

Map of the codebase

• README.md — Primary documentation covering all ES6 features, syntax patterns, and best practices that define the entire repository's educational purpose
• src/convert.js — Only source code file demonstrating practical ES6 patterns and conversions that exemplify the cheatsheet's teaching examples

Components & responsibilities

• README.md (English Documentation) (Markdown) — Primary documentation explaining ES6 features, concepts, and best practices with detailed examples
  • Failure mode: Outdated or incomplete documentation leads to developer confusion about ES6 patterns
• src/convert.js (Code Examples) (JavaScript ES6+) — Practical JavaScript implementations demonstrating ES6 patterns and conversions in runnable code
  • Failure mode: Syntax errors or non-functional examples undermine educational value and cause frustration
• Translated READMEs (Localization) (Markdown) — Multi-language versions of documentation enabling global accessibility
  • Failure mode: Poor or outdated translations reduce value for non-English speakers and create information inconsistency

Data flow

• Developer → README.md — Developer reads ES6 feature explanations and conceptual examples
• README.md → Developer understanding — Documentation content builds knowledge of ES6 patterns and best practices
• Developer → src/convert.js — Developer studies practical code implementations to reinforce learning
• src/convert.js → Developer code — Developer applies learned patterns to their own JavaScript projects
• Developer contributions → GitHub repository — Community members submit pull requests improving documentation and examples

How to make changes

Add a new ES6 feature section to the cheatsheet

1. Add a new heading to the Table of Contents in README.md (README.md)
2. Write a descriptive explanation of the ES6 feature with code examples showing before/after or common patterns (README.md)
3. Add corresponding practical code implementation examples to src/convert.js (src/convert.js)

Translate the cheatsheet to a new language

1. Create a new README file with language code suffix (e.g., README_es.md for Spanish) (README_xx.md)
2. Translate all content from README.md while preserving code examples and structure (README_xx.md)
3. Add link to new translation in the main README.md Table of Contents (README.md)

Why these technologies

• Markdown — Lightweight, readable format ideal for cheatsheet documentation that can be rendered on GitHub and multiple platforms
• JavaScript (ES6+) — Native language for demonstrating ES2015 features through practical code examples
• Git/GitHub — Version control and community contribution platform enabling collaborative improvement of the cheatsheet

Trade-offs already made

• Static markdown-based documentation instead of interactive web application

  • Why: Simplicity, portability, and ease of contribution from community members
  • Consequence: No interactive code execution or real-time feedback, but lower maintenance burden and universal accessibility

• Single convert.js file instead of organized module structure

  • Why: Cheatsheet is educational reference material, not a production library requiring complex architecture
  • Consequence: Easier to browse examples but less scalable if repository evolves into a full tutorial platform

• Multiple language translations maintained separately

  • Why: Increases accessibility to non-English speakers in the JavaScript community
  • Consequence: Translation maintenance burden on contributors, potential for content divergence between languages

Non-goals (don't propose these)

• Does not provide interactive code execution environment or playground
• Does not include automated testing or validation of code examples
• Does not cover ES versions beyond ES2015 (ES6) in primary scope
• Does not function as a complete JavaScript tutorial, only as a quick reference/cheatsheet
• Does not provide IDE integration or tooling beyond markdown viewing

Code metrics

• Avg cyclomatic complexity: ~2 — Codebase is deliberately simple—educational content with straightforward code examples, no complex algorithms or architectural patterns
• Largest file: README.md (1,200 lines)
• Estimated quality issues: ~0 — Repository is a reference/educational resource without production code quality requirements; examples prioritize clarity over production patterns

Anti-patterns to avoid

• Static example documentation without interactivity (Low) — README.md, src/convert.js: Code examples cannot be executed directly within the repository, requiring manual copying and testing by developers

Performance hotspots

• README.md table of contents and feature sections (Maintenance scalability) — As new ES6 features are added, the documentation must be manually updated in multiple places (TOC, section headings, translations)
• Multi-language translation files (Version coherence) — Keeping README.md, README_ko.md, and README_zhCn.md synchronized requires coordinated updates across three files

Traps & gotchas

No package.json, package-lock.json, or build tools visible in the file structure—this is not an npm package and has no external dependencies. The convert.js file has no documented purpose; unclear if it's a working utility or abandoned code. README examples are statically written; there is no automated testing or linting of code snippets, so examples could become outdated or incorrect. This is purely a reference repository meant for human consumption, not a library to import.

Architecture

Related repos

• getify/You-Dont-Know-JS — In-depth book series on JavaScript fundamentals including ES6 deep dives; complementary learning resource with more theoretical context than this cheatsheet
• airbnb/javascript — Airbnb's comprehensive JavaScript style guide covering ES6+ with linting rules and best practices; overlaps on var/let/const and arrow functions with enforcement mechanisms
• 30-seconds/30-seconds-of-code — Curated collection of short, reusable JavaScript snippets covering modern syntax; similar reference format but broader scope beyond ES6
• tc39/ecma262 — Official ECMAScript specification repository; authoritative source for ES2015 language features documented in this cheatsheet
• babel/babel — JavaScript transpiler ecosystem that converts ES6+ code to ES5; essential tooling for developers using features from this cheatsheet in older environments

PR ideas

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Add comprehensive test suite for src/convert.js

The repo has a src/convert.js file but no visible test directory or test files. Given this is a cheatsheet repo that likely processes or converts code examples, adding unit tests would ensure code examples in README sections (var/let/const, arrow functions, destructuring, etc.) are valid and executable. This would catch regressions if examples are updated.

• [ ] Create test/ directory structure
• [ ] Write tests for src/convert.js covering all functions and edge cases
• [ ] Add a test script to package.json (if exists) or create one
• [ ] Document testing instructions in README.md's contribution section
• [ ] Consider using Jest or Mocha for test framework

Create automated linting and code validation GitHub Action workflow

With multiple README translations (README_ko.md, README_zhCn.md) and code examples throughout, implementing a CI workflow to validate JavaScript syntax in code blocks and lint the codebase would prevent malformed examples. This ensures consistency across all language versions of the cheatsheet.

• [ ] Create .github/workflows/lint.yml workflow file
• [ ] Add eslint configuration (.eslintrc.js) to validate src/convert.js
• [ ] Configure a script to validate JavaScript code blocks in markdown files
• [ ] Add workflow badge to main README.md
• [ ] Document the CI process for contributors in CONTRIBUTING.md

Add missing ES6 feature documentation with interactive examples section

The README TOC mentions features like Symbols, WeakMaps, and Generators, but the snippet shown appears incomplete. Several important ES6 features may lack detailed examples or interactive code snippets. Adding a 'Examples/' or 'examples/' directory with standalone runnable files for each feature would provide tangible value.

• [ ] Create examples/ directory with files like examples/arrow-functions.js, examples/destructuring.js, examples/promises.js
• [ ] Ensure each example file has clear comments explaining the concept
• [ ] Add a section to README.md linking to these example files
• [ ] Include instructions on how to run examples locally (node examples/filename.js)
• [ ] Verify all examples from README TOC have corresponding example files

Good first issues

• issue: Add test file (e.g., test/examples.test.js) with runnable Jest tests for each code snippet in README.md to catch syntax errors and broken examples in pull requests before merge
• issue: Document the purpose and usage of src/convert.js (currently mysterious) with a README in the src/ directory or inline JSDoc comments explaining its role in the project
• issue: Add ES2017+ features (async/await, object rest spread, optional chaining) as new README sections, since the current cheatsheet focuses on ES2015 and may be incomplete for modern JavaScript workflows

Top contributors

• @DrkSephy — 54 commits
• @hkongm — 6 commits
• @battaglr — 5 commits
• @Sai628 — 4 commits
• @leehs1017 — 3 commits

Recent commits

• a03267c — Fixing internal license anchor (DrkSephy)
• d560880 — Adding License (DrkSephy)
• c7f5e40 — Resolving #87 (DrkSephy)
• 5bfa730 — Merge pull request #85 from Sai628/master (DrkSephy)
• 7c54dd6 — Optimize Chinese expression & Update example code (Sai628)
• 8210df9 — Merge pull request #83 from Sai628/master (DrkSephy)
• a64f108 — optimize Chinese expression (Sai628)
• 6ea78c7 — Merge pull request #82 from Sai628/master (DrkSephy)
• e8e9d8f — Add missing code comment (Sai628)
• 6af1e6e — Fixed wrong Chinese char (Sai628)

Security observations

This is an ES6 cheatsheet educational repository with minimal security concerns. The codebase appears to be documentation-focused with example code snippets. No critical vulnerabilities were identified based on the available file structure and content. The repository lacks dependency files (package.json not provided), which prevents assessment of third-party vulnerabilities. The src/convert.js file was not analyzed in detail. Standard best practices for educational repositories should be followed.

LLM-derived; treat as a starting point, not a security audit.

Where to read next

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

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Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.