Скачать или смотреть REACT STATE | STATE vs Prop | why to use STATE | Diff btw STATE and Variable

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In React, state refers to the data or information that changes within a component over time. It's a way to store and manage data that can be updated and used within a component.

Here are some key points about state in React:

1. State is an object: State is stored as an object within a component.
2. State changes over time: State can be updated and changed as the user interacts with the component.
3. State affects rendering: When state changes, the component re-renders with the new state.
4. State is local: State is specific to each component and is not shared between components.

Types of state in React:

1. Local state: State that is stored within a single component.
2. Global state: State that is shared between multiple components (e.g., using Redux or Context API).

When to use state:

1. User input: Store user input data in state (e.g., form data).
2. Dynamic data: Store data that changes over time (e.g., API responses).
3. Component behavior: Store data that affects component behavior (e.g., toggle buttons).

How to use state:

1. useState hook: Use the useState hook to create and manage state in functional components.
2. this.state: Use the this.state object to access and update state in class components.

Best practices:

1. Keep state minimal: Only store necessary data in state.
2. Use immutable state: Avoid mutating state directly; instead, use the useState hook or this.setState() method.
3. Use state selectively: Only use state when necessary; consider using props or context instead.