Questions
6 of 10
Basics
JSX
Virtual DOM
Reconciliation
State and Props
Components
Class Components
Function Components
Lifecycle functions
Code Sharing
Hooks
useState
useReducer
useMemo
useContext
useCallback
useEffect
Custom Hooks
New Hooks
HOC
Refs
Data Sharing
Events
Context API
Redux
Router
CSR-SSR
React APIs
Performance Optimisation
ReactDOM
Strict Mode
Security
What is the store?
Difficulty: 5/10
Redux store, state management, middleware
- 1
The current Redux application state lives in an object called the store. Redux stores its application state in a plain JavaScript object called the store.
- 2
The store is a single source of truth that holds the entire application state.
- 3
It has a method called getState that returns the current state value
javascript
Scenario Questions
0-2 years experience
- 1How would you set up a Redux store for a simple counter component that only needs increment and decrement actions?
- 2What happens if you dispatch an action before the store has been created, and how would you prevent that?
2-5 years experience
- 1You added a new feature that updates a user's profile in the store, but the UI never shows the new data. Walk me through how you would debug the issue.
- 2Explain why you would choose Redux Thunk over putting async API calls directly inside reducers when handling data fetching.
5-8 years experience
- 1Your application’s Redux store has grown to dozens of slices and is causing noticeable UI lag. How would you restructure the store to improve performance and maintainability?
- 2Design a strategy to share a piece of state (e.g., authentication token) across multiple micro‑frontends that each have their own isolated Redux store.
8+ years experience
- 1Your organization wants to migrate from a single monolithic Redux store to a modular, feature‑based store architecture across several teams. What steps would you take to plan and execute that migration safely?
- 2Given long‑term maintenance concerns and a mixed skill set on the team, how would you decide whether to keep Redux or adopt a newer state‑management library like Recoil or Zustand?
Follow-up Questions
- Can you sketch the minimal code for creating that store?
- What are the trade‑offs of putting async logic in reducers versus middleware?
- How would you verify that your store changes are correctly reflected in the UI?