9/21/2023 0 Comments Redux hooks![]() ![]() However, each call will create an individual subscription to the redux store. You may call the useSelector() any number of times in a single function. The useSelector() hook will subscribe to the redux store and runs whenever an action is dispatched. The function will be called with the entire redux store state as an argument and runs whenever the functional components render the page. However, the main difference between the two is that the mapStateToProps pass down multiple values as props whereas the useSelector will take the current state as the argument and returns a single variable as a result. Moreover, when an action is performed, the useSelector() hook will compare the results of the previous and current selector values and if they are different then the component is bound to re-render otherwise it stays the same. However, there exist some differences between the two such as the selector can return any value as the result and not just an object. It is equivalent to the mapStateToProps argument used in the connect() function conceptually. The useSelector hooks allow you to extract data or the state from the Redux store using a selector function. The useSelector hook is equivalent to the mapStateToProps and takes an argument that returns the part of the state that the component needs whereas the hook useDispatch acts just like mapDispatchToProps. However, with the introduction of hooks, useSelector and useDispatch served as an alternative to the connect() function. The connect() function takes two optional parameters- mapStateToProps, and mapDispatchToProps. ![]() They are introduced in React version 16 and are constantly improved over time.īefore the introduction of hooks in react, React redux used the higher order component connect() to connect a component to the redux store and read the values from the redux store each time a state gets updated. React Hooks are APIs that give the functional components the ability to manage the state of an application, handle the side effects, and write clean and simpler code for an application. What are useDispatch and useSelector Hooks in React.js? An example of creating an action, reducers folder, implementing redux, and using the useSelector and useDispatch hooks. ![]() What are useSelector and useDispatch hooks and how do use them in React ?.In this article, we will be discussing hooks in redux.However, if one wants a simpler and cleaner code with redux then they shall learn about the hooks - useSelector and useDispatch in Redux that serve as an alternative to the existing connect() higher-order function. If you have worked with Redux before, then you might agree that despite being a great state management tool, Redux is a little complicated when it comes to the boilerplate code that it needs before you start a project. ![]()
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