Redux in React JS
React, a JavaScript library for building user interfaces has become immensely popular for its simplicity and efficiency. However, as applications grow in complexity, managing life cycle state across components can become challenging. This is where Redux, a predictable state container, comes into play. In this blog post, we will delve into the world of Redux and explore how it can be seamlessly integrated into Redux in React JS applications.
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Understanding Redux:
Redux is a state management library that helps in managing the state of an application in a predictable way. It follows the Flux architecture and provides a single source of truth for the entire application state. The three core principles of Redux are:
- Single Source of Truth: The state of your whole application is stored in an object tree within a single store.
- State is Read-Only: The only way to change the state is to emit an action, an object describing what happened.
- Changes are made with Pure Functions: To specify how the state tree is transformed by actions, you write pure reducers.
Core Concepts:
Store:
The store is the heart of Redux, holding the complete state tree of the application.
It allows access to state via getState().
State can only be modified by dispatching actions.
Actions:
Actions are plain JavaScript objects that describe changes in the application.
They must have a type property indicating the type of action being performed.
Additional data can be included as needed.
Reducers:
Reducers specify how the application’s state changes in response to actions.
They are pure functions that take the current state and an action, and return a new state.
Dispatch:
Dispatching an action is the only way to trigger a state change.
It sends the action to the store, and the corresponding reducer processes it to update the state. Everything in React is a component, which can be thought of as independent, reusable pieces of code.
Integration with React:
Provider:
The Provider component from the react-redux library is used to wrap the entire application.
It provides the Redux store to all components in the React tree.
Connect:
The connect function is used to connect React components to the Redux store.
It enables components to subscribe to the Redux store and receive updates when the state changes.
mapStateToProps:
A function that allows components to access the state from the Redux store as props.
mapDispatchToProps:
A function that provides components with action creators as props, allowing them to dispatch actions.
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Example Workflow:
Let’s take a simple example of a counter application to illustrate the Redux workflow:
- Action Types:
const INCREMENT = ‘INCREMENT’;
const DECREMENT = ‘DECREMENT’;
- Action Creators:
const increment = () => ({type: INCREMENT});
const decrement = () => ({type: DECREMENT });
- Reducer:
const counterReducer = (state = 0, action) => {
switch (action.type) {
case INCREMENT:
return state + 1;
case DECREMENT:
return state – 1;
default:
return state;
}
};
- Store:
import {createStore} from ‘redux’;
const store = createStore (counterReducer);
- Connecting Components:
// CounterComponent.js
import { connect } from ‘react-redux’;
const CounterComponent = ({ count, increment }) => {
return (
<div>
<p>Count: {count}</p>
<button onClick={increment}>Increment</button>
</div>
);
};
const mapStateToProps = (state) => ({
count: state.counter,
});
const mapDispatchToProps = (dispatch) => ({
increment: () => dispatch ({ type: ‘INCREMENT’ }),
});
export default connect(mapStateToProps, mapDispatchToProps)(CounterComponent);
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Provider Component: Wrap the root component of your application with the Provider component to make the Redux store available to all components.
// index.js
import React from ‘react’;
import ReactDOM from ‘react-dom’;
import { Provider } from ‘react-redux’;
import store from ‘./store’;
import App from ‘./App’;
ReactDOM.render (
<Provider store = {store}>
<App />
</Provider>,
document.getElementById (‘root’)
);
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Thus we now understand that Redux is a powerful state management library that enhances the scalability and maintainability of React.js applications. While it adds a layer of complexity, especially for smaller projects, its benefits become more apparent as applications grow in size and complexity. By understanding the core concepts of Redux and its integration with React, developers can build more robust and maintainable applications.
Author:-
Sarika Ganesh Kore
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