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Code Patterns

Reusable patterns for implementing ParleyJS in your applications.

Overview

This section provides battle-tested patterns for common scenarios. These patterns are production-ready and follow best practices for security, error handling, and performance.

Unlike guides which focus on specific use cases, patterns are reusable building blocks you can adapt to any scenario.

Available Patterns

Communication Patterns

• Request-Response - Request-response workflows

  • Simple RPC calls
  • Query with validation
  • Pipeline pattern
  • Timeout handling

• Error Handling - Error handling strategies

  • Try-catch patterns
  • Fallback patterns
  • Retry logic
  • Error recovery

• State Synchronization - State sync patterns

  • Synced state class
  • Event emitter pattern
  • Store synchronization
  • Conflict resolution

Advanced Patterns

For more advanced patterns, see CODE_PATTERNS.md:

• Event emitter pattern
• Channel pooling
• Debouncing and batching
• Performance optimization

Pattern Organization

Patterns are organized by:

• Complexity - Simple to advanced
• Purpose - What problem they solve
• Use case - When to use them

Each pattern includes:

• Problem description
• Solution code
• When to use
• Trade-offs
• Related patterns

Using These Patterns

If you want to:

• Send a message and get response → Request-Response
• Handle errors gracefully → Error Handling
• Keep state in sync → State Synchronization

If you're building:

• A widget → Start with Request-Response
• A complex app → Use State Synchronization
• Production code → Review Error Handling

Pattern vs Guide

Patterns are:

• Reusable code snippets
• Solution-focused
• Technology-agnostic
• Composable

Guides are:

• Complete implementations
• Problem-focused
• Use-case specific
• End-to-end

Use patterns when you need a specific solution. Use guides when you need complete implementation steps.

Related Sections

• Guides - Use-case specific implementations
• CODE_PATTERNS.md - Additional advanced patterns
• Examples - Complete working examples
• API Reference - Method documentation

Best Practices

When using these patterns:

• Always validate origins (see Security)
• Handle errors gracefully (see Error Handling)
• Test thoroughly (see Testing Patterns)
• Consider performance (see Performance)

Contributing Patterns

Have a pattern to share? See Contributing Guide.

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Navigation

Patterns:

• Request-Response
• Error Handling
• State Synchronization

Related:

• Advanced Patterns
• Testing Patterns

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