UseSelector A Guide to React Redux Hooks
Improve productivity and simplify state management with useSelector
USESELECTOR AND USEDISPATCH IN REACT REDUX
Using useSelector and useDispatch allows for an alternative to the connect() higher-order component. useSelector can replace map state to props by taking in a function argument that specifies the desired part of the state. On the other hand, useDispatch can replace map dispatch to props. To utilize useDispatch, it can be invoked and stored to a variable such as dispatch. This dispatch variable can then work with allActions imported from the actions folder.
Install necessary dependencies
what is redux?
what is react-redux?
React-Redux is a library that facilitates the integration of Redux with React JS, enabling the use of a global state management system. It offers bindings that enable React components to interact with the Redux store and dispatch actions. This allows developers to take a cohesive approach to state management in their React applications, improving efficiency and consistency.
Create Redux store
What is Redux Store?
Why implementing Redux in Root File?
- Wrap your entire app with a Provider component from react-redux, which provides access to the Redux store to all components in the app.
- Set up any middleware or enhancers that you want to use with your store, such as redux-thunk for handling asynchronous actions, or redux-devtools-extension for debugging your store in the browser.
- Configure the initial state of your store and set up any necessary reducers or actions.
- Easily manage any changes or updates to your store, such as adding new reducers or middleware, by making changes in a single centralized location.
Implementing Redux in the root file also helps to improve the overall performance and efficiency of your app. By creating a single global store instance, you can avoid duplicating state across multiple components, and ensure that all components have access to the same up-to-date data.
Create a selector function to extract the counter state from the store:
Create a React component that uses useSelector to access the counter value and display it
Render the Counter component in your app
benefits of useSelector
- Simplified code:
With useSelector, you don't need to write a separate mapStateToProps function and connect your component to the store using connect. Instead, you can define a selector function inline and use it directly in your component.
- Efficient updates:
useSelector uses the strictEqual comparison algorithm to compare the selected data with its previous value, which means that your component will only re-render when the selected data has actually changed.
useSelector automatically memoizes the selected data, which means that if the dependencies of your selector function haven't changed, it will return the previously computed value instead of recomputing it.
- Easy testing:
In addition to these benefits, useSelector also supports more advanced features like selecting data from nested slices of the store, composing selectors, and using selectors with the useMemo hook to further optimize performance.
Overall, useSelector is a powerful tool for working with Redux in React, and its simplicity and efficiency make it a great choice for building scalable and maintainable applications.