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.
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
Use const by default: Only use let when reassignment is needed
Prefer arrow functions: Especially for callbacks
Use template literals: Instead of string concatenation
Destructure objects and arrays: For cleaner code
Use async/await: Instead of Promise chains
Avoid mutating data: Use spread operator and array methods
Use optional chaining: Prevent "Cannot read property of undefined"
Use nullish coalescing: For default values
Prefer array methods: Over traditional loops
Use modules: For better code organization
Write pure functions: Easier to test and reason about
Use meaningful variable names: Self-documenting code
Keep functions small: Single responsibility principle
Handle errors properly: Use try/catch with async/await
Use strict mode: 'use strict' for better error catching