modern-javascript-patterns

npx skills add wshobson/agents --skill modern-javascript-patterns --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# 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. **U