Redux Introduction
As your React application grows, managing state across many components becomes challenging. Props drilling and complex component hierarchies make state hard to track and debug. **Redux** is a predictable state container that helps you manage global state in a consistent way.
What is Redux?
Redux is a library for managing application state. It centralizes all state in a single store and provides strict rules for how state can be updated, making state changes predictable and traceable. It follows three core principles:
- Single source of truth: The entire state of your app is stored in one store.
- State is read-only: The only way to change state is to dispatch an action.
- Changes are made with pure functions: Reducers specify how state changes in response to actions.
Think of Redux like a bank vault. Everyone can look at the money (state), but to change it you must fill out a form (action) and give it to a teller (reducer) who updates the vault according to strict rules.
Why Use Redux?
- Centralized state easier to debug and test.
- Predictable updates state changes follow a strict pattern.
- Time-travel debugging you can step through state changes.
- Great ecosystem middleware like Redux Thunk, DevTools.
Core Concepts
| Concept | Description |
|---|---|
| Store | Holds the whole state tree of your application. |
| Action | A plain object describing what happened (e.g., { type: 'ADD_TODO', payload: 'Learn Redux' }). |
| Reducer | A pure function that takes current state and an action, and returns the new state. |
| Dispatch | The method to send an action to the store. |
Basic Redux Flow
- User interacts with UI, which calls an action creator.
- Action creator returns an action object.
- Store dispatches the action to the reducer.
- Reducer computes the new state.
- Store updates and UI re-renders.
Two Minute Drill
- Redux is a predictable state container for JavaScript apps, often used with React.
- It centralizes state in a single store and updates it via actions and reducers.
- Three core principles: single source of truth, state is read-only, changes via pure reducers.
- Redux helps manage complex state and makes debugging easier.
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