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Chapter 32

State & Effects

useState, useEffect, lists, keys, controlled forms. The 80% of every React app.

3 lessons

~1.3 hr

useState & Updater

Batching, lazy init, immutable updates, the updater function.

useEffect (and when NOT to)

Sync with external systems. Cleanup. Race conditions.

Lists, Keys, Forms

Stable keys. Controlled inputs. Common bugs.