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+---
+name: modern-javascript-patterns
+description: 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.
+---
+
+# 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
+
+## Detailed patterns and worked examples
+
+Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient.
+
+## Best Practices
+
+1. **Use const by default**: Only use let when reassignment is needed
+2. **Prefer arrow functions**: Especially for callbacks
+3. **Use template literals**: Instead of string concatenation
+4. **Destructure objects and arrays**: For cleaner code
+5. **Use async/await**: Instead of Promise chains
+6. **Avoid mutating data**: Use spread operator and array methods
+7. **Use optional chaining**: Prevent "Cannot read property of undefined"
+8. **Use nullish coalescing**: For default values
+9. **Prefer array methods**: Over traditional loops
+10. **Use modules**: For better code organization
+11. **Write pure functions**: Easier to test and reason about
+12. **Use meaningful variable names**: Self-documenting code
+13. **Keep functions small**: Single responsibility principle
+14. **Handle errors properly**: Use try/catch with async/await
+15. **Use strict mode**: `'use strict'` for better error catching
+
+For common pitfalls (this binding, promise anti-patterns, memory leaks), see [references/advanced-patterns.md](references/advanced-patterns.md).