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of 49How does Redux Toolkit differ from traditional Redux?
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Key differences include:
- Less boilerplate: RTK eliminates action creators, action types, and switch statements
- Immer integration: Allows "mutative" logic that's actually immutable under the hood
- Built-in middleware: Includes redux-thunk and other middleware by default
- DevTools: Automatically configured Redux DevTools
- TypeScript support: Better TypeScript integration out of the box
- Modern patterns: Encourages modern Redux patterns and best practices
Traditional Redux required separate action creators, reducers with switch statements, and manual store configuration. RTK consolidates these into simpler APIs.
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What is `configureStore` and what advantages does it provide?
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configureStore is RTK's enhanced version of Redux's createStore. It provides several advantages:
- Automatic middleware setup: Includes redux-thunk and development-time middleware
- DevTools integration: Automatically connects to Redux DevTools
- Serializable state checks: Warns about non-serializable values in development
- Immutability checks: Detects state mutations in development
- Simplified configuration: Reduces boilerplate for common store setup
const store = configureStore({
reducer: {
counter: counterSlice.reducer,
user: userSlice.reducer
}
});
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Explain the concept of "slices" in Redux Toolkit
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A slice is a collection of Redux reducer logic and actions for a single feature of your application. It's created using createSlice and includes:
- Initial state: The starting value for this slice of state
- Reducers: Functions that define how state updates in response to actions
- Actions: Automatically generated action creators based on reducer names
- Action types: Automatically generated action type strings
Slices eliminate the need to write separate action creators and action types, reducing boilerplate significantly.
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How does `createSlice` work and what does it return?
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createSlice accepts a configuration object and returns an object containing:
- reducer: The slice reducer function
- actions: Object with action creators for each reducer
- name: The slice name
- getInitialState: Function returning initial state
const counterSlice = createSlice({
name: 'counter',
initialState: { value: 0 },
reducers: {
increment: (state) => {
state.value += 1; // Immer makes this safe
},
incrementByAmount: (state, action) => {
state.value += action.payload;
}
}
});
// Returns: { reducer, actions: { increment, incrementByAmount } }
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How does Immer integration work in Redux Toolkit?
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RTK uses Immer under the hood, allowing you to write "mutative" logic that's actually immutable:
- Direct mutations: You can modify state directly in reducers
- Immer magic: Immer creates a new immutable state tree
- Performance: Immer optimizes updates by only changing what's necessary
- Type safety: Works seamlessly with TypeScript
You can either mutate the draft state OR return a new state, but not both in the same reducer.
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What are `extraReducers` and when would you use them?
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extraReducers allow a slice to respond to actions that weren't defined in its own reducers field:
- External actions: Handle actions from other slices
- Async thunks: Handle pending/fulfilled/rejected states from
createAsyncThunk - Action matching: Use builder pattern or map object notation
const userSlice = createSlice({
name: 'user',
initialState: { data: null, loading: false },
reducers: {},
extraReducers: (builder) => {
builder
.addCase(fetchUser.pending, (state) => {
state.loading = true;
})
.addCase(fetchUser.fulfilled, (state, action) => {
state.data = action.payload;
state.loading = false;
});
}
});
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How do you handle complex state updates with nested objects in RTK?
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Thanks to Immer, you can directly modify nested properties:
const userSlice = createSlice({
name: 'user',
initialState: {
profile: {
name: '',
address: {
street: '',
city: ''
}
}
},
reducers: {
updateAddress: (state, action) => {
// Direct assignment works with Immer
state.profile.address = action.payload;
},
updateCity: (state, action) => {
state.profile.address.city = action.payload;
}
}
});
For complex scenarios, you might still return a new state object if the logic is clearer that way.
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What is the `prepare` callback in RTK reducers?
What is `createAsyncThunk` and how does it work?
How do you handle loading states with `createAsyncThunk`?
What are the options available in `createAsyncThunk`'s `thunkAPI` parameter?
What is RTK Query and how does it differ from createAsyncThunk?
How do you define an API service with RTK Query?
How do you optimize component re-renders when using Redux Toolkit?
How do you test Redux Toolkit slices and async thunks?
What are RTK Query hooks and how do they work?
How do you handle RTK Query conditional fetching?
How do you handle RTK Query error scenarios?
How do you implement pagination with RTK Query?
How do you handle file uploads with RTK Query?
How do you handle race conditions and request cancellation with RTK?
How does caching work in RTK Query?
What are cache tags and how do you use them for cache invalidation?
How do you handle optimistic updates with RTK Query?
How do you implement custom base queries in RTK Query?
What are entity adapters and when should you use them?
How do you structure large Redux applications with RTK?
How do you handle side effects and middleware with RTK?
How do you implement undo/redo functionality with RTK?
How do you handle complex form state with RTK?
How do you implement real-time updates with WebSockets in RTK?
How do you handle data normalization patterns with RTK?
How do you implement middleware for logging and debugging in RTK?
How do you handle code splitting and lazy loading of Redux slices?
How do you implement custom RTK Query transformations?
How do you implement RTK Query with authentication?
How do you implement RTK Query batch operations?
How do you implement RTK Query with WebSocket streaming?
How do you test RTK Query endpoints?
How do you implement RTK Query cache invalidation strategies?
How do you implement RTK Query middleware for logging?
How do you handle optimistic updates with conflict resolution?
How do you implement RTK Query with TypeScript generics?
How do you implement custom cache selectors with RTK Query?
How do you implement RTK Query with complex caching strategies?
How do you implement RTK Query monitoring and analytics?
How do you implement custom base queries for different services?
How do you implement data synchronization patterns with RTK Query?
How do you implement comprehensive performance optimization for RTK Query?
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Redux Toolkit cheatsheet
Redux Toolkit (RTK) Interview Cheat Sheet
- Summary01
- 📦 Installation02
- 🏗️ Core Concepts03
- 🔧 Essential Hooks04
- 🚀 Async Operations05
- 🌐 RTK Query - Data Fetching06
- 🛠️ Advanced Patterns07
- 📝 Best Practices08
- Key Interview Concepts09
- Advanced RTK Patterns10
- Performance Optimization Strategies11
- Common Pitfalls & Solutions12
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