Redux is a predictable state container principally designed for JavaScript applications. It efficiently manages and updates the app state, serving as a centralized global store.

Core Concepts

Store

The store is at Redux’s nucleus and acts as a single source of truth. Here, you’ll find the current state alongside the ability to dispatch actions.

Actions

Actions are payloads of data - typically objects - that describe what needs to happen. These are dispatched to the store.

Reducers

Reducers are pure functions that specify how the state changes in response to actions. Each reducer handles a particular part of the state and combines to produce the full state.

View

The user interface (UI) or the output your app produces, is ideally a direct derivative of the current state. Both are connected through subscription and rendering.

Data Flow

Redux follows a straightforward loop, or unidirectional data flow, that tallies with its action-reducer-store structure.

1. Acquiring Action:

   • The UI elements, like buttons, yield actions.

2. Dispatcher Role:

   • Through store.dispatch(action), these actions are transmitted to the store.

3. Action Execution and State Mutation:

   • With defined logic, reducers modify the state, originating a new state tree.

4. State Change Subscription notification:

   • Subscribed UI segments receive alerts about the state change and update correspondingly.

5. Render Action:

   • The updated state triggers view re-renders, aligning the UI with the latest state.

Key Benefits

• Increased Predictability: The sequence of state alterations is preset and controlled.
• Simplified State Management: Every part of the state is stored in one location.
• Streamlined Code Execution:
  • Reducers define state modifications, making it easier to trace changes.
  • Debugging becomes more straightforward and time-efficient.

Application Across Tech Stacks

While most associates developed Redux for React, the library is platform-agnostic. Adaptors and connectors permit its use with a spectrum of libraries, chiefly react-redux. Other integrations include Angular, Vue.js, and vanilla JavaScript applications.