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?

Difficulty: 6/10
feature-based slice layout, shared reducers & utilities, scalable folder conventions

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

Scenario Questions

0-2 years experience

  1. 1We need to add a new "notifications" feature. Where would you create the slice file and how would you name it?
  2. 2If you accidentally import the user slice inside the notifications reducer, what kind of runtime error might you see and why?
  3. 3You have a small app with only two features. How would you organize the slices to keep the codebase tidy?

2-5 years experience

  1. 1After adding three new feature slices, the bundle size increased noticeably. What re‑organization steps would you take to keep the store lean?
  2. 2A 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. 3You 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. 1Design 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. 2How would you implement cross‑feature communication (e.g., one slice reacting to another slice's actions) without tightly coupling the slices?
  3. 3When scaling the store, what strategies would you use to keep reducer initialization fast and support code‑splitting of slices?

8+ years experience

  1. 1Your 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. 2How would you version and deprecate slices that are shared across several micro‑frontends while minimizing breaking changes?
  3. 3In 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?
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