Redux is a popular state management library that is used by many developers to manage the state of their applications. If you are new to Redux, the core concepts may seem confusing at first. In this beginner's guide, we'll break down the core concepts of Redux, including the three principles of Redux, the Redux store, actions, reducers, and the role of the Provider component.
The Three Principles of Redux
Before we dive into the details of Redux, it's essential to understand the three principles of Redux:
Single Source of Truth: The entire state of an application is stored in a single object tree within a store.
State is Read-Only: The state is immutable, and the only way to change it is by dispatching an action.
Changes are Made with Pure Functions: Reducers are pure functions that take the previous state and an action, and return a new state.
The Redux Store
The Redux store is a JavaScript object that contains the entire state of your application. The store is created using the createStore() function, which takes a reducer as its argument. The reducer is a pure function that takes the current state and an action, and returns a new state.
Actions
Actions are plain JavaScript objects that describe what happened in your application. An action must have a type property, which is a string that describes the action. Actions can also contain additional data that is necessary to update the state.
Reducers
Reducers are pure functions that take the current state and an action, and return a new state. Reducers should not modify the existing state; instead, they should return a new object that represents the new state.
The Provider Component
The Provider component is a higher-order component that allows you to provide the Redux store to your React components. The Provider component takes a store as its prop, and any component that needs access to the store can use the connect() function from the react-redux library.
Conclusion
In this beginner's guide, we covered the core concepts of Redux, including the three principles of Redux, the Redux store, actions, reducers, and the Provider component. Redux can be confusing at first, but understanding these concepts is crucial to building scalable and maintainable applications with Redux. If you are new to Redux, take the time to understand these concepts, and you'll be on your way to becoming a Redux expert.
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