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Modern Javascript Patterns

Seth HobsonCommunityCreated by Seth Hobson

  • Skill
  • Guidelines
  • Software development
  • MIT
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From the author

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.
— the description by Seth Hobson

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a structured reference for modern JavaScript (ES6+) development. It covers essential syntax improvements, functional programming techniques, and best practices designed to help developers write more maintainable, readable, and performant code. The content spans core language features like arrow functions, destructuring, and spread operators, as well as advanced concepts such as higher-order functions, composition, and asynchronous patterns.

What it does

  • Explains modern ES6+ syntax including arrow functions, template literals, and modules.
  • Demonstrates object and array destructuring for cleaner data handling.
  • Provides patterns for functional programming, including map, filter, reduce, and composition.
  • Covers asynchronous JavaScript using Promises and async/await.
  • Offers best practices for immutability, error handling, and code organization.
  • Includes advanced techniques like memoization, currying, and partial application.

When to use it

  • When refactoring legacy JavaScript codebases to modern standards.
  • When implementing functional programming paradigms in JavaScript applications.
  • When optimizing performance and readability in new projects.
  • When migrating from callback-based asynchronous code to Promises and async/await.
  • When seeking standard patterns for data transformation and state management.

Advantages

  • Promotes the use of clean, self-documenting, and maintainable code.
  • Reduces common bugs through modern features like optional chaining and nullish coalescing.
  • Encourages functional programming practices that simplify testing and debugging.
  • Provides clear, actionable examples for complex language features.
  • Helps standardize coding styles across development teams.

Usage examples

“How can I refactor a traditional loop to use modern functional array methods?”
The agent will provide examples using map, filter, or reduce to replace imperative loops, improving code readability and immutability.
“Explain how to use destructuring to clean up my function parameters.”
The agent will show how to extract properties directly from objects in function signatures, reducing boilerplate code.
“Show me how to use async/await to handle multiple API calls.”
The agent will provide a pattern for using async/await with Promise.all to execute concurrent operations efficiently.
“What is the best way to copy an object while updating one property?”
The agent will demonstrate the use of the spread operator to create a shallow copy with updated values immutably.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/wshobson/modern-javascript-patterns/download

  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip modern-javascript-patterns.zip -d .agents/skills

Documentation by Seth Hobson

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.

Files

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by
Seth Hobson
Publisher
Seth Hobson (Community)
Source
wshobson/agents · plugins/javascript-typescript/skills/modern-javascript-patterns · commit 4bde316
Licence
MIT License (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced

AutoGineer is not affiliated with or endorsed by Seth Hobson or Seth Hobson.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download modern-javascript-patterns.zip