That said, Redux is most commonly used with React. You may not find this useful when you are using plain react. I used it in my apps, quickly forgot about Redux, and never looked back. Its really simple, right? React Context with hooks is much easier to implement & since it’s built into React and you therefore need no extra third-party dependencies, so total bundle size won’t increase. We will try to show some simple actions and reducers, required to manage the state using redux. As I said above, my habit is to use a tool like Redux or Apollo for my data management, my React state handles local information, often UI state, and context handles static data, such as theming. At a high level, we can say, Redux is far from dead or be killed by React Context & still it is one of the greatest solutions towards props drilling even it requires a bunch of libraries. (And maybe, just maybe, some folks will read this article and not feel the need to post the same question that's been asked a million times already...). They both have: However, there's still a number of very significant differences in the capabilities and behaviors of Context + useReducer vs those of Redux + React-Redux. So, you can use Redux for some state that's global, and useReducer + Context for some state that's more local, and Context by itself for some semi-static values, all at the same time in the same application. I've answered various questions about Context and Redux hundreds of times across the internet (including my posts Redux - Not Dead Yet!, React, Redux, and Context Behavior, A (Mostly) Complete Guide to React Rendering Behavior, and When (and when not) to Reach for Redux), yet the confusion continues to get worse. Again, these are different tools, with different purposes and use cases, and are worth evaluating based on your use case. As someone that looked at Redux as a junior developer and instantly felt defeated, learning about context was a relief. No. The actual Redux store is injected into the tree at runtime using the React-Redux component. Chris Achard: Can You Replace Redux with React Hooks? It is really a tough question. for static values and then propagate updates through subscriptions. Let's recap the use cases for each of these: Again, these are different tools that solve different problems! The only overlap between them, really, is "can be used to avoid prop-drilling". Redux came out in 2015, and quickly won the "Flux Wars" because it had the best design, matched the problems people were trying to solve, and worked great with React. I realize that this post won't stop the seemingly never-ending debate over "Context vs Redux?!?!?!?!?". The React Context API provides a way to pass data through the component tree without having to pass props down manually to every level. The primary problem with legacy context was that updates to values passed down via context could be "blocked" if a component skipped rendering via shouldComponentUpdate. React Context will trigger a re-render on each update, and optimizing it manually can be really tough. Now the Context is ready to be used. Redux is nothing but a solution to manage the global data for your app so that you can access the global data anywhere in your app and it removes the props drilling as well. Conceptually, this is a form of "Dependency Injection". Reduce React State with Hooks and Context. Add 3 files: actions.js, reducers.js, StoreContext.js. The patterns and tools provided by Redux make it easier to understand when, where, why, and how the state in your application is being updated, and how your application logic will behave when those changes occur. React Consumer example on CodeSandbox.. First, we create a new context, which we store in NumberContext.This is an object with 2 properties: Provider and Consumer.They’re a matched pair, and they’re born knowing how to communicate with each other (but not with other contexts). Any time you have some value that you want to make accessible to a portion of your React component tree, without passing that value down as props through each level of components. So, in order to actually know when to use them, we need to first clearly define what they do and what problems they solve. In this article: What is Redux? First of all, we will create a context for user data. You already get basic knowledge of Redux and React Context. There are three principles of Redux: Single source of truth; State is read-only So we will keep & update some user data in the redux state. for static values and then propagate updates through subscriptions. Many people chose Redux early on specifically to let them avoid prop-drilling, because React's legacy context was broken and React-Redux worked correctly. Since many components relied on shouldComponentUpdate for performance optimizations, that made legacy context useless for passing down plain data. In React, this is usually solved by making a component “controlled”. Redux, however, comes with its own complexities and challenges. The way components communicate and share state with each other, defines their success story. React Context API. Note: This article covers only the context API. Definitive answers and clarification on the purpose and use cases for Context and Redux . React Context for State Management React 16.3 added a new Context API – new in the sense that the old context API was a behind-the-scenes feature that most people either didn’t know about, or avoided using because the docs said to avoid using it. Without React Context or Redux, we resort to a technique called “prop drilling” where we pass data down components even though some of those components don’t need that specific data. React Context does not meet those criteria. Context is a form of Dependency Injection. Finishing with the comment of Sebastian Markbåge (Facebook React Team), My personal summary is that new context is ready to be used for low frequency unlikely updates (like locale/theme). You need to determine which of these tools best matches the set of problems that you're trying to solve! No. On the other hand for complex or high-frequency update Redux should be used, React Context won’t be a good solution. Even when you are looking at the App Component and you know there is a problem in one of the properties of state, but you have to look at all the components which are Consuming it to figure out which one of them caused the problem. 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Only tools to think about data through the component tree without having to props.
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