Redux & Redux Toolkit Course
Redux & Redux Toolkit
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Beginner

Redux Best Practices

Definition

The official Style Guide provided by the Redux maintainers, detailing essential rules and highly recommended patterns.

Explain Like I'm New

The 10 Commandments of Redux. Break them, and your app will be slow, buggy, and hard to read. Follow them, and Redux will feel like a superpower.

Real World Example

Rule #1: Do NOT mutate state. Rule #2: Reducers must not have side effects. Rule #3: Do NOT put non-serializable values (like Promises or Functions) in the store.

Common Use Cases

  • •Code reviews
  • •Onboarding new developers

Terminal Output

bash / terminal
/* ESSENTIAL REDUX RULES (Do not break these): 1. State must be immutable. 2. Reducers must be pure. 3. State must be serializable (No Maps, Sets, Promises, or Functions). STRONGLY RECOMMENDED: 1. Use Redux Toolkit exclusively. 2. Use Immer for writing immutable updates. 3. Group code by Feature folders (Ducks pattern). 4. Evaluate selectors using shallowEqual or Reselect. 5. Keep state as flat (normalized) as possible. */

Interview Questions

basic

  • Can you put a React component (like `<MyIcon />`) into the Redux state tree?

intermediate

  • Why does the Style Guide recommend modeling Actions as 'Events' rather than 'Setters'?

Flash Cards

Question

React component in Redux?

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Answer

NEVER. A component is a complex JavaScript object/function. It is not serializable. It will break Redux DevTools and time-travel debugging. Only store pure data (strings, booleans, arrays, plain objects).

Question

Events vs Setters?

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Answer

Instead of `setUserName('John')`, dispatch `userLoggedIn({ name: 'John' })`. Redux is an event-sourcing system. Actions should describe WHAT happened, not HOW the state should change. Multiple reducers might want to listen to the `userLoggedIn` event!