Gain insights into Redux, an open-source library for managing app state. Learn about Redux store creation, middleware, state management, error handling, testing, and building robust applications.

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Redux

In this course, you will take a deep dive into Redux, an open-source JavaScript library for managing application state.

You will start by running through what Redux is, general concepts, and basic implementation. With the basics out of the way, you will begin working on building a recipe book application, adding more bells and whistles to it as the course progresses. You will learn to create a Redux store, how to work with middleware, state management, error handling, testing, and a whole lot more.

By the end, you will have advanced knowledge of one the most popular libraries among React and Angular developers. You will have the skills to create highly performant and consistent.

The Ultimate Guide to Redux



One of the requirements of `combineReducers()` is for each reducer to define a default value for its substate.  When using this approach, the default structure of the state tree is built dynamically by the reducers. This guarantees that changes to the tree require changes only to the applicable reducers and do not affect the rest of the tree.

This is possible because Redux dispatches a special action called `@@redux/INIT` when the store is created. Each reducer receives that action together with the undefined initial state, which gets replaced by the default parameter defined inside the reducer. 

Because our `switch` statements in the previous example do not process this special action type and simply return the state, the reducers automatically populate the initial state of the store.

~~~~~~~

const recipesReducer = (recipes, action) => {
  switch (action.type) {
    case ADD_RECIPE:
      return recipes.concat(action.payload);
    ...
  }
}
~~~~~~~

To support this, each of the sub-reducers must define a default value for its first argument to use if none is provided:


~~~~~~~
const initialState = [];

const recipesReducer = (recipes = initialState, action) => {
  switch (action.type) {
    case ADD_RECIPE:
      return recipes.concat(action.payload);
    ...
  }
}
~~~~~~~


Learn about the default value requirement in reducers.

Introduction to Redux

Basic Redux Implementation

Cloning a Redux Boilerplate

Complete Redux Project

Creating a Store

Decorating the Store

Actions and Action Creators

Redux Thunk

Redux-Actions Library

Reducers

Avoiding Mutations

Introduction to Middleware

Your First Middleware

Middleware

State Management

Keeping a Normalized State

Persistence State

Real-World State

Server Communication

Moving Code from Action Creators

Error Handling

Server Communication II

Transforming Data

Chaining Requests

Managing Side Effects

Messaging Patterns

WebSockets

WebSocket Authentication

Testing

Testing Action Creators

Async Action Creators

Testing Reducers

Testing Middleware

Testing Async Middleware

Integration Tests

Evolution Of Redux

Final Assessment

Default Values