Q921. 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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Q922. What is the output of below string expression?
```javascript console.log("Welcome to JS world"[0]); ``` The output of the above expression is "W". **Explanation:** The bracket notation with specific index on a string ...
Q923. How do you handle cross-slice communication?
Since each `createSlice` only manages its own piece of state, a few patterns let one slice react to actions or data from another: 1. **`extraReducers`**: listen for anoth...
Q924. What is the purpose of Error object?
The Error constructor creates an error object and the instances of error objects are thrown when runtime errors occur. The Error object can also be used as a base object ...
Q925. 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, ...
Q926. What is the purpose of EvalError object?
The EvalError object indicates an error regarding the global `eval()` function. Even though this exception is not thrown by JavaScript anymore, the EvalError object remai...
Q927. 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 "...
Q928. What are the list of cases error thrown from non-strict mode to strict mode?
When you apply 'use strict'; syntax, some of the below cases will throw a SyntaxError before executing the script 1. When you use Octal syntax ```javascript var n = 022; ...
Q929. 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...
Q930. 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...