Questions
12 of 14
1What is a slice in Redux Toolkit?
2How is a slice different from a traditional Redux reducer?
3What are the key properties inside createSlice()?
4How does createSlice() automatically generate action creators?
5What does the name field in a slice represent?
6How do you combine multiple slices into one store?
7How do you access a slice’s state in a component using?
8Can you modify the state directly in a slice reducer? Why does it work?
9What’s the purpose of extraReducers in createSlice()?
10How do you handle async actions (e.g., thunks) inside a slice using extraReducers?
11What is the difference between reducers and extraReducers in a slice?
12How do you organize slices in a large application?
13Can multiple slices modify the same part of state?
14How do you reset a slice’s state to its initial value?
RTKRTK
Basics
Slice
Actions
Reducers
RTK Query
Store
Thunk
Scenario Based
12 / 14

How do you organize slices in a large application?

In large Redux Toolkit applications, it’s best to organize slices by feature or domain. Each slice manages a specific part of the state, making the codebase modular, scalable, and easier to maintain.

Best Practices for Organizing Slices
  1. 1

    Create separate folders for each feature (e.g., features/user, features/posts).

  2. 2

    Place slice files, thunks, and selectors related to a feature inside its own folder.

  3. 3

    Combine all slice reducers in a central store.js or store/index.js using configureStore().

  4. 4

    Use clear and consistent naming for slice files (e.g., userSlice.js, postSlice.js).

Example: Folder Structure for Large Apps
Difficulty: 6/10
Topics: feature-based slice layout, shared reducers & utilities, scalable folder conventions

Scenario Questions

0-2 years experience
  1. 1

    We need to add a new "notifications" feature. Where would you create the slice file and how would you name it?

  2. 2

    If you accidentally import the user slice inside the notifications reducer, what kind of runtime error might you see and why?

  3. 3

    You have a small app with only two features. How would you organize the slices to keep the codebase tidy?

2-5 years experience
  1. 1

    After adding three new feature slices, the bundle size increased noticeably. What re‑organization steps would you take to keep the store lean?

  2. 2

    A teammate changed a selector and now it returns undefined for a piece of state that used to work. How would you trace the problem back to slice organization?

  3. 3

    You notice that two slices are importing each other's actions, creating a circular dependency. How would you refactor the slices to break the cycle?

5-8 years experience
  1. 1

    Design a folder structure for an application that will eventually have 50 feature slices, shared utilities, and async thunks. Explain the trade‑offs of your layout.

  2. 2

    How would you implement cross‑feature communication (e.g., one slice reacting to another slice's actions) without tightly coupling the slices?

  3. 3

    When scaling the store, what strategies would you use to keep reducer initialization fast and support code‑splitting of slices?

8+ years experience
  1. 1

    Your organization is migrating from a monolithic Redux store to RTK with feature slices owned by multiple teams. What governance model and guidelines would you put in place to ensure consistent slice organization?

  2. 2

    How would you version and deprecate slices that are shared across several micro‑frontends while minimizing breaking changes?

  3. 3

    In a large, multi‑repo codebase, how do you enforce slice naming, folder conventions, and testing standards across teams without adding excessive overhead?

Follow-up Questions

  • ❓What naming conventions would you enforce for slice files and actions?
  • ❓How do you handle logic that needs to be reused across multiple slices?
  • ❓Which testing strategy do you apply to verify slice isolation?