React useContext Guide

useContext provides a way to share values between components without passing props through every level of the tree.

Context Selectors (Custom Pattern)#

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Best Practices#

Context Design:
✓ Split state and dispatch contexts
✓ Memoize context values
✓ Create custom hooks
✓ Use meaningful defaults

Performance:
✓ Keep context values stable
✓ Split contexts by update frequency
✓ Use memo for consumers
✓ Consider external state libraries for complex needs

Organization:
✓ One context per concern
✓ Colocate provider with related components
✓ Export custom hooks, not raw context
✓ Document context requirements

Avoid:
✗ Putting everything in one context
✗ Frequent context value updates
✗ Deeply nested providers
✗ Using context for local state

useContext eliminates prop drilling and enables clean state sharing across component trees. Create custom hooks to encapsulate context access, split contexts by update frequency for performance, and memoize values to prevent unnecessary re-renders. For complex state management, consider combining context with useReducer or external libraries.

React useContext Guide

Basic Usage#

Creating Context with Types#

Provider Pattern#

Multiple Contexts#

Context with Reducer#

Performance Optimization#

Default Values#

Nested Providers#

Context Selectors (Custom Pattern)#

Testing with Context#

Common Patterns#

Best Practices#

Conclusion#

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