React Design and Engineering Patterns

React design quality depends on component contracts, reuse strategy, and behavior consistency under change.

Component API design

Design component APIs for readability and extension. Avoid prop explosion and ambiguous booleans.

Reuse patterns

  • Composition with children and slots.
  • Custom hooks for shared behavior.
  • Renderless logic components when needed.

Testing design

Test user outcomes and behavior contracts instead of internal implementation details.

Performance patterns

Profile first, then optimize with memoization or structural changes based on evidence.

Engineering checklist

  1. Clear API contracts.
  2. Accessible interactions.
  3. Deterministic side effects.
  4. Documented trade-offs.

Practice

Design a reusable data-table component API and implement one production-quality usage in a feature module.