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modern-javascript-patterns

combined

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

• 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

When not to use

• The task is unrelated to modern javascript patterns
• You need a different domain or tool outside this scope
• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Skill page

Conflict

The three copies share the same high-level scope and use-case list, but they diverge in how they instruct the agent. The first two are thin wrappers that defer to a resources/implementation-playbook.md file, while the third copy inlines a detailed ES6+ reference (arrow functions, destructuring, spread/rest, template literals, object literals, and the start of async patterns). Crowning one copy would either hide the inline reference or hide the resource-based workflow, so the catalog should combine them.