Isolating Redux Sub-Apps Consider the case of a “big” app (contained in a <BigApp> component) that embeds smaller “sub-apps” (contained in <SubApp> components): import React, { Component } from 'react' import SubApp from './subapp' class BigApp extends Component { render() { return ( <div> <SubApp /> <SubApp /> <SubApp /> </div> ) } } These <SubApp>s will be completely independent. They won't share

bindActionCreators(actionCreators, dispatch) Turns an object whose values are action creators, into an object with the same keys, but with every action creator wrapped into a dispatch call so they may be invoked directly. Normally you should just call dispatch directly on your Store instance. If you use Redux with React, react-redux will provide you with the dispatch function so you can call it directly, too. The only use case for bindActionCreators is when you want to pass some action creators

Redux FAQ Table of Contents General When should I use Redux? Can Redux only be used with React? Do I need to have a particular build tool to use Redux? Reducers How do I share state between two reducers? Do I have to use combineReducers? Do I have to use the switch statement to handle actions? Organizing State Do I have to put all my state into Redux? Should I ever use React's setState()? Can I put functions, promises, or other non-serializable items in my store state? How d

Redux FAQ: Store Setup Table of Contents Can or should I create multiple stores? Can I import my store directly, and use it in components myself? Is it OK to have more than one middleware chain in my store enhancer? What is the difference between next and dispatch in a middleware function? How do I subscribe to only a portion of the state? Can I get the dispatched action as part of the subscription? Store Setup Can or should I create multiple stores? Can I import my store directly, and

subscribe(listener) Adds a change listener. It will be called any time an action is dispatched, and some part of the state tree may potentially have changed. You may then call getState() to read the current state tree inside the callback. You may call dispatch() from a change listener, with the following caveats: The listener should only call dispatch() either in response to user actions or under specific conditions (e. g. dispatching an action when the store has a specific field). Calling di

Data Flow Redux architecture revolves around a strict unidirectional data flow. This means that all data in an application follows the same lifecycle pattern, making the logic of your app more predictable and easier to understand. It also encourages data normalization, so that you don't end up with multiple, independent copies of the same data that are unaware of one another. If you're still not convinced, read Motivation and The Case for Flux for a compelling argument in favor of unidirectiona

Reducers Actions describe the fact that something happened, but don't specify how the application's state changes in response. This is the job of a reducer. Designing the State Shape In Redux, all application state is stored as a single object. It's a good idea to think of its shape before writing any code. What's the minimal representation of your app's state as an object? For our todo app, we want to store two different things: The currently selected visibility filter; The actual list of tod

Usage with React From the very beginning, we need to stress that Redux has no relation to React. You can write Redux apps with React, Angular, Ember, jQuery, or vanilla JavaScript. That said, Redux works especially well with libraries like React and Deku because they let you describe UI as a function of state, and Redux emits state updates in response to actions. We will use React to build our simple todo app. Installing React Redux React bindings are not included in Redux by default. You need

Troubleshooting This is a place to share common problems and solutions to them. The examples use React, but you should still find them useful if you use something else. Nothing happens when I dispatch an action Sometimes, you are trying to dispatch an action, but your view does not update. Why does this happen? There may be several reasons for this. Never mutate reducer arguments It is tempting to modify the state or action passed to you by Redux. Don't do this! Redux assumes that you never mut

Async Actions In the basics guide, we built a simple todo application. It was fully synchronous. Every time an action was dispatched, the state was updated immediately. In this guide, we will build a different, asynchronous application. It will use the Reddit API to show the current headlines for a selected subreddit. How does asynchronicity fit into Redux flow? Actions When you call an asynchronous API, there are two crucial moments in time: the moment you start the call, and the moment when y