React Context Best Practices

React Context provides component-tree-wide state sharing. Here's how to use it effectively.

Best Practices#

Design:
✓ Create custom hooks for consuming context
✓ Split state and dispatch contexts
✓ Memoize context values
✓ Use TypeScript for type safety

Performance:
✓ Avoid frequent context updates
✓ Split contexts by update frequency
✓ Memoize callbacks in providers
✓ Consider selector patterns

Testing:
✓ Create test wrappers
✓ Allow initial state injection
✓ Mock contexts for unit tests
✓ Test provider and consumer separately

Avoid:
✗ Prop drilling alternatives only
✗ Context for high-frequency updates
✗ Too many nested providers
✗ Missing error boundaries

React Context is powerful for sharing state across components. Split contexts by update frequency, memoize values and callbacks, and always create custom hooks for consuming context. For high-frequency updates or complex state, consider dedicated state management libraries.

React Context Best Practices

Creating Context#

Splitting State and Dispatch#

Memoizing Context Value#

Composing Multiple Providers#

Context with Initialization#

Context with Selectors#

Testing Context#

Context with Persistence#

Common Pitfalls#

Best Practices#

Conclusion#

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