How do you access a slice’s state in a component using?

Q: How do you access a slice’s state in a component using?

In Redux Toolkit, the **`useSelector` and `useDispatch`** hook from React-Redux allows you to read data and dispatch actions of a specific slice of the Redux store inside a React component. Import the `useSelector` or useDispatch hook from `react-redux`. Use it inside your component to access the slice’s state or dispatch from event handlers and functions. Reference the slice key you defined in `configureStore()` (e.g., `state.counter.value`, dipatch(increment())). import React from 'react'; import { useSelector, useDispatch } from 'react-redux'; import { increment } from './features/counterSlice'; function Counter() { // Access the counter slice state const count = useSelector((state) => state.counter.value); const dispatch = useDispatch(); return ( Count: {count} dispatch(increment())}>Increment ); } export default Counter;

Difficulty: 6/10

useSelector, state normalization, memoization

In Redux Toolkit, the useSelector and useDispatch hook from React-Redux allows you to read data and dispatch actions of a specific slice of the Redux store inside a React component.

Steps to Access Slice State

1
Import the useSelector or useDispatch hook from react-redux.
2
Use it inside your component to access the slice’s state or dispatch from event handlers and functions.
3
Reference the slice key you defined in configureStore() (e.g., state.counter.value, dipatch(increment())).

Example: Accessing Slice State with useSelector

Scenario Questions

0-2 years experience

2-5 years experience

1A feature shows a list of orders and their total prices, but the UI lags when scrolling. You suspect the selector is recalculating too often. How would you investigate and fix it?

Follow-up Questions