What is the main difference between using React-Redux Hooks and React-Redux Connect()?

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I am about to start a project with React-Redux. For the APIs references there are Hooks and connect(). Since, Hooks are the alternate of connect APIs. What is the difference of using hooks or connect to my React-Redux project.

connect is a High Order Component whose job is to provide a way to connect Redux's store to your components. useSelector and useDispatch are the equivalent hooks. Just another technique to do the same thing.

class Component extends React.Component{
    componentDidMount(){
        const { fetchApi, arg } = this.props
        fetchApi(arg)
    }
}
const mapDispatchToProps = dispatch =>({
    fetchApi : arg => dispatch(fetchApi(arg))
})
const mapStateToProps = state =>({
    arg : state.arg
})

export default connect(mapStateToProps, mapDispatchToProps)(Component)

Now the equivalent using hooks

const Component = () =>{
    const dispatch = useDispatch()
    const arg = useSelector(state => state.arg)

    useEffect(() =>{
       dispatch(fetchApi(arg))
    },[dispatch, arg])
}

Both do exactly the same thing, it's only a different approach to connect redux to components internal state. Both consume Redux's context to expose dispatch and state inside a given component

Hooks · React Redux, connect is a High Order Component whose job is to provide a way to connect Redux's store to your components . useSelector and useDispatch  React's new "hooks" APIs give function components the ability to use local component state, execute side effects, and more. React Redux now offers a set of hook APIs as an alternative to the existing connect () Higher Order Component. These APIs allow you to subscribe to the Redux store and dispatch actions, without having to wrap your components in connect ().

React-Redux internally uses React Context to connect components to the store.

The connect() function wraps your component into another component that connects to the store context and forwards the selected state to your component as props.

If you called...

const YourConnectedComponent = connect(mapStateToProps)(YourComponent)`

...you can imagine the wrapper to roughly look like this:

const YourConnectedComponent = props => (
    <StoreContext.Consumer>
        {state => <YourComponent {...props} {...mapStateToProps(state, props)} />}
    </StoreContext.Consumer>
);

mapStateToProps in this case would be the function you provided to connect(). This is very simplified and it doesn't actually look exactly like this for various performance reasons but it is suitable to demonstrate the general concept.

The useSelector hook also consumes the store context but without creating a component in between for that. It directly returns the selected state for the component to use it. It internally uses useContext which is "the hooks way" to consume a context.

useDispatch just exposes dispatch() to your component for it to dispatch actions with it.

Technically the outcome is more or less the same whether you are using hooks or connect().

Connect · React Redux, React's new "hooks" APIs give function components the ability to use local set of hook APIs as an alternative to the existing connect() Higher Order Component. However, there are some differences between the selectors passed to useSelector() will do a reference comparison of the previous selector  “Should I use react-redux connect, or the hooks API?” That depends. connect creates a reusable higher-order component, whereas the hooks API is optimized for integration with a single component.

React State vs. Redux State: When and Why?, A summary of the shopping cart with Redux Hooks and the Reselect Library. The traditional way React Components connect to the redux store. this is where the biggest difference between connect and useSelector is. Hooks are a type of function that enable the execution of custom code in a base code. In React, Hooks are special functions that allow us to “hook into” its core features. React Hooks provide an alternative to writing class-based components by allowing us to easily handle state management from functional components. The useContext Hook

Hooks enable you to access dispatch and redux-state directly with out connecting the component using connect and hooks can be used only in functional components

Connect enables us to link our component(Class or functional ) with redux-store,

You can refer to react-redux hooks documentation from this link.

It has given different hooks like

useSelector using which we can access redux store useDispatch returns dispatch function with which we can dispatch redux actions

Sample usage of redux hooks for a component will be(Can use this only in functional Components)

functions Test() {
const dispatch = useDispatch()
const count = useSelector(state => state.counter)
// If you want to dispatch a redux action using hooks then
// Assume a redux action called increaseCounter

return (
<>
<p>{count}</p>
<button onClick={() => {dispatch(increaseCounter(count + 1))}}>
ClickMe!
</button></>)
}

If you want to achieve the same using connect then(you can use this in Class or functional components)

function Test() {
  return (
    <>
      <p>{this.props.count}</p>
      <button onClick={() => {this.props.increaseCounter(this.props.count+1)}}>Click Me!</button>
    </>
  );
}

const mapStateToProps = state => {
  return {
    count: state.counter
  };
};

const mapDispatchToProps = dispatch => {
  return bindActionCreators({ increaseCounter }, dispatch);
};

export default connect(mapStateToProps, mapDispatchToProps)(Test)

General, React Redux launched support for Hooks. and look into the tradeoffs of using these hooks versus the `connect` higher-order component. to determine if components should re-render instead of shallow object comparison. React-Redux Hooks article is a second part of the previous article about React Hooks, We will go through three main points in this article: 1- Hooks for Redux. 2- Hooks APIs.

What is the main difference between using React-Redux Hooks and , Easily share state between different components. The primary selling points of React hooks are: Use state and With tools like the react-redux hooks API, and React's useReducer hook, there's no need to choose one over the other. Will you need to connect the same store props to other components? The only difference between React Hooks and React Redux is that the “dispatch” function name is reserved in React Redux. In React Hooks we create our own “dispatch” function name through the useReducer hook. To call the dispatch function in React Redux we use the syntax this.props then the name of the property in mapDispatchToProps

How Redux Connect compares to the new Redux Hooks., Build and refactor modern React.js applications using Hooks Daniel Bugl. Container components use a connector to connect Redux to a presentational Takes the current Redux state, and returns an object of props to be passed to the​  The main difference with hooks comes in connecting specific components to the store to access state. Before hooks if we wanted a component to have access to the store we needed to use the connect higher-order component. import {connect} from 'react-redux' export default connect() (Animes)

Using Redux with React Hooks, When React introduced hooks, redux shortly brought in hooks support as well! So​, instead of using the connect function to connect the central store with  Here's an example using a function component: There's a setTimeout of 2 seconds before an action dispatches that turns the App div green. There's also an example of that same component using a hook instead of connect. The main difference between connect and hooks are that connect essentially acts as React.memo for the component.

Comments
  • How will you gauge the perf differences?
  • Very true, I find my hooked components a tad slower than the HOC ones. I wonder what React is doing to address this in the Hook infrastructure or does the fault lie more with React-Redux? And can performance tweak be otherwise exposed via the useSelector function?
  • @Eniola React authors/maintainers would know better, I got a feeling they accept that now hooks offer less optimisation choices. The good thing about connect() is it accepts both function and class components so one can always use Redux with a function component without hooks.