modern-javascript-patterns from hermeticormus/claude-code-game-development is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
Master ES6+ features including async/await, destructuring, spread operators, arrow functions, promises, modules, iterators, generators, and functional programming patterns for writing clean, efficient JavaScript code. Use when refactoring legacy code, implementing modern patterns, or optimizing JavaScript applications.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Modern JavaScript Patterns
Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code.
## When to Use This Skill
- Refactoring legacy JavaScript to modern syntax
- Implementing functional programming patterns
- Optimizing JavaScript performance
- Writing maintainable and readable code
- Working with asynchronous operations
- Building modern web applications
- Migrating from callbacks to Promises/async-await
- Implementing data transformation pipelines
## ES6+ Core Features
### 1. Arrow Functions
**Syntax and Use Cases:**
```javascript
// Traditional function
function add(a, b) {
return a + b;
}
// Arrow function
const add = (a, b) => a + b;
// Single parameter (parentheses optional)
const double = x => x * 2;
// No parameters
const getRandom = () => Math.random();
// Multiple statements (need curly braces)
const processUser = user => {
const normalized = user.name.toLowerCase();
return { ...user, name: normalized };
};
// Returning objects (wrap in parentheses)
const createUser = (name, age) => ({ name, age });
```
**Lexical 'this' Binding:**
…
The line at the top of this page pins the label git:20251120.50bf83d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_tqixixh3zikasr4j
GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/claude-code-game-development/modern-javascript-patterns
GET https://markdownregistry.com/api/v1/blob/98c861b36cc37530499bf48ace5d3f5ca5c0f29fa873b5d24a2d1f40f89af1cd
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