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wshobson/agents/plugins/javascript-typescript/skills/modern-javascript-patterns/SKILL.md

modern-javascript-patterns

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.

Source repository stars
39,130
Declared platforms
0
Static risk flags
1
Last source update
2026-08-24
Source checked
2026-08-26
DecisionCompatibilityInstallWorkflowPermissionsEvidenceSourceFAQ

Decision brief

What it does: where it fits

Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code.

Best for

  • Refactoring legacy JavaScript to modern syntax
  • Implementing functional programming patterns
  • Optimizing JavaScript performance

Not for

  • Tasks that require unconfirmed production actions or broad system permissions.
  • Environments where the pinned source and install steps cannot be inspected.

Compatibility matrix

Platform support, with evidence labels

PlatformStatusEvidenceWhat to check
CodexNot declaredNo explicit evidencePortability before use
Claude CodeNot declaredNo explicit evidencePortability before use
CursorNot declaredNo explicit evidencePortability before use
Gemini CLINot declaredNo explicit evidencePortability before use
Open the compatibility checker

Installation

Inspect first. Install second.

The source command is displayed only when detected. A safe inspection prompt is always available so your agent can explain every action before execution.

Source-detected install commandSource
npx skills add https://github.com/wshobson/agents --skill "plugins/javascript-typescript/skills/modern-javascript-patterns"
Safe inspection promptEditorial

Inspect the Agent Skill "modern-javascript-patterns" from https://github.com/wshobson/agents/blob/d82998e7df393c671ede2387a8435075f0b633f5/plugins/javascript-typescript/skills/modern-javascript-patterns/SKILL.md at commit d82998e7df393c671ede2387a8435075f0b633f5. List every install step, command, network request, credential, file read/write, external action, and rollback step. Explain whether it fits my task. Do not install or execute anything until I approve.

Workflow

What the source asks the agent to do

  1. 01

    When to Use This Skill

    Refactoring legacy JavaScript to modern syntax

    Refactoring legacy JavaScript to modern syntaxImplementing functional programming patternsOptimizing JavaScript performance
  2. 02

    Detailed patterns and worked examples

    Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

    Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
  3. 03

    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. Av…

    Use const by default: Only use let when reassignment is neededPrefer arrow functions: Especially for callbacksUse template literals: Instead of string concatenation

Permission review

Static risk signals and limitations

Reads files

low · line 18

The documentation asks the agent to read local files, directories, or repositories.

Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient.

Evidence record

Why each signal appears

EvidenceSourceComputedTestedEditorial
SignalValueEvidence typeMeaning
Quality score74/100ComputedDocumentation, specificity, maintenance, and trust rules
Repository stars39,130SourceRepository attention, not individual Skill quality
Compatibility0 platformsSourceDeclared in the catalog source record
Usage guideautomated source guideEditorialGenerated or reviewed according to the visible evidence level

Pinned source

Provenance and original SKILL.md

Repository
wshobson/agents
Skill path
plugins/javascript-typescript/skills/modern-javascript-patterns/SKILL.md
Commit
d82998e7df393c671ede2387a8435075f0b633f5
License
MIT
Collected
2026-08-26
Default branch
main
View the original SKILL.md

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.

Frequently asked questions

What to verify before installation and use

What does the modern-javascript-patterns source document cover?

Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code.

How do I install modern-javascript-patterns?

The source record exposes this install command: npx skills add https://github.com/wshobson/agents --skill "plugins/javascript-typescript/skills/modern-javascript-patterns". Inspect the command and pinned source before running it.

Which permission-related actions were detected?

Static rules flagged read-files in the source; the page lists the matching lines and excerpts.

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