useState Basics & Correct Updates
useState fundamentals and correct updates (value vs functional updater); recognize stale reads and batched updates.
Overview
Goal: Learn how useState works and how to update it correctly when changes depend on the previous value.
- State value + setter
- Batched updates
- Functional updater
useState in one minute
useState returns an array: [value, setValue]. Calling setValue schedules a re-render; React may batch multiple updates for performance.
All lessons in this course
- useState Basics & Correct Updates
- Event Handling: onClick & onChange
- Controlled vs Uncontrolled Inputs (Intro)