Common useState Patterns

Let's explore practical patterns for managing state in React applications. These patterns will help you write cleaner, more maintainable code.

Functional Updates

When the new state depends on the previous state, use a function:

Toggle Pattern

A simple but common pattern for boolean state:

Counter Pattern

Managing numeric state with increment/decrement:

List Management Pattern

Managing arrays with add, remove, update operations:

Form State Pattern

Managing form inputs as a single state object:

Exercise: Toggle Implementation

Exercise: Counter with Steps

Exercise: Selection State

Key Takeaways

1. Functional updates - Use prev => newValue when depending on previous state
2. Toggle pattern - Simple prev => !prev for booleans
3. Counter pattern - Include increment, decrement, reset, and bounds
4. List pattern - Add, remove, update with unique IDs
5. Form pattern - Centralized values, errors, and touched state