Q51. How would you structure Redux in a large application?
The recommended approach (and what Redux Toolkit is designed around) is a **"feature folder" / "ducks"** structure rather than splitting by technical type (`actions/`, `r...
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Q52. What are Redux serializable values?
Redux (and Redux Toolkit's default middleware) expects **state and actions to contain only plain, serializable data**: strings, numbers, booleans, `null`, plain objects, ...
Q53. How do you handle race conditions in Redux?
A race condition happens when multiple async requests are in flight and they **resolve out of order** — e.g., a user types quickly in a search box, an older request for "...
Q54. How do you persist Redux state?
**`redux-persist`** is the standard library for persisting and rehydrating a Redux store across page reloads/app restarts. It wraps your root reducer so selected slices a...
Q55. How do you debug a Redux performance problem?
A practical, step-by-step approach: 1. **Confirm it's actually Redux**: use the React DevTools **Profiler** to see which components re-render and how often, before assumi...
Q56. What should be stored in Redux vs derived with selectors?
A common mistake is storing **computed/derived values** in Redux state itself, which then has to be kept in sync manually every time the source data changes. The rule of ...
Q57. Would you put all API data into Redux?
**No** — not by default. Server data (see [client state vs server state](#what-is-the-difference-between-client-state-and-server-state)) has different needs than plain cl...
Q58. How to use `connect()` from React Redux?
You need to follow two steps to use your store in your container: 1. **Use `mapStateToProps()`:** It maps the state variables from your store to the props that you specif...
Q59. Whats the purpose of `at` symbol in the Redux connect decorator?
The **@** symbol is in fact a JavaScript expression used to signify decorators. _Decorators_ make it possible to annotate and modify classes and properties at design time...
Q60. How do you get redux scaffolding using create-react-app?
Redux team has provided official redux+js or redux+typescript templates for create-react-app project. The generated project setup includes, 1. Redux Toolkit and React-Red...