# Modern Javascript Patterns > Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code. Use when this capability is needed. - Skill: `tomevault-io/modern-javascript-patterns-5` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/modern-javascript-patterns-5` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/modern-javascript-patterns-5/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/modern-javascript-patterns-5 --- # Modern JavaScript Patterns Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code. ## Use this skill when - 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 ## Do not use this skill when - The task is unrelated to modern javascript patterns - You need a different domain or tool outside this scope ## Instructions - Clarify goals, constraints, and required inputs. - Apply relevant best practices and validate outcomes. - Provide actionable steps and verification. - If detailed examples are required, open `resources/implementation-playbook.md`. ## Resources - `resources/implementation-playbook.md` for detailed patterns and examples. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/sickn33) — claim your Tome and manage your conversions.