react context vs state

One can declare state in top component and use it in child component with the help of React Context API. In this quick 5-minute tutorial, you'll see an introduction to what Context is and how to use it! I’ve created a demo application in code sandbox. Context in React allows you to pass data to any component without “prop drilling”. Now the Context is ready to be used. Architecturally, Redux emphasizes using functional programming principles to help you write as much of your code as possible as predictable "reducer" functions, and separating the idea of "what event happened" from the logic that determines "how the state updates when that event happens". Before React hooks, Redux was the go-to solution of developers manage global state. Notes on React Context API, how to create a Context, consume it, and pass values to a Context Provider. We know that our Redux-connected React components need to talk to a Redux store, but we don't know or care which Redux store that is when we define the component. Along with Reducer Hooks API, the React Context API provides all the ingredients necessary to replace Redux in many usages. With React version 16.3.0, it bundles with a built in state management tool, Context API. Think of it this way. React Context will trigger a re-render on each update, and optimizing it manually can be really tough. React Context vs Redux Store. No. Again, these are different tools, with different purposes and use cases, and are worth evaluating based on your use case. However, this pattern comes handy when you are designing a complex app since it solves multiple problems. Also, it is possible to update the context data from any subscribed component. It’s a predictable state container for JavaScript apps. The React-Redux library is the official UI binding layer that lets React components interact with a Redux store by reading values from Redux state and dispatching actions. 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. Data fetching libraries like React Query, SWR, Apollo, and Urql all provide abstractions that simplify common patterns for working with cached server state (and the upcoming "RTK Query" library will do the same for Redux Toolkit). This is called props drilling and this is avoided by using a global store which is accessible to whole app. We will try to show some simple actions and reducers, required to manage the state using redux. Fantastic stuff in the toolkit. # Redux vs React’s Context API. First of all, we will create a context for user data. When the app is refreshed this method will be called and set some hard-coded data in context. This may sound obvious, but React Context API is not a state management tool per-se. The actual behavior of the app would have been the same overall. In this article, we share a short overview of state management, context API, and Flux architecture. I'll try to clarify what Context and Redux actually are, how they're meant to be used, how they're different, and when you should use them. React-Redux provides a connect function for you to read values from the Redux store. "Context vs Redux" has been one of the most widely debated topics within the React community ever since the current React Context API was released. Let's recap the use cases for each of these: Again, these are different tools that solve different problems! Context Vs Props in React. "Avoiding prop-drilling" is one of those other reasons. Context in React.js is the concept to pass data through a component tree without passing props down manually to each level. Instead, it's like a pipe or a wormhole. So, how do you decide whether to use Context, Context + useReducer, or Redux + React-Redux? The way components communicate and share state with each other, defines their success story. 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. React uses provider pattern in Context API to share data across the tree descendant nodes. Other valid reasons to use Redux include: Dan Abramov listed a number of these use cases when he wrote his post You Might Not Need Redux, all the way back in 2016. # The React Context API. We specifically encourage putting "global state" in Redux and "local state" in React components, and carefully deciding whether each piece of state should live in Redux or component state. Other posts in this series: Random musings on React, Redux, and more, by Redux maintainer Mark "acemarke" Erikson, Collector of interesting links, answerer of questions, A (Mostly) Complete Guide to React Rendering Behavior, the actual description of Context from the React docs, any component that reads from that context will be forced to re-render, the "Redux Essentials" tutorial in the Redux docs, Redux was originally created as an implementation of the "Flux Architecture", middleware as a way to extend the capabilities of the Redux store, including handling side effects, the Redux Devtools, which allow you to see the history of actions and state changes in your app over time, "State" is any data that describes the behavior of an application, categories like "server state", "communications state", and "location state", David Khourshid, author of the XState library and an expert on state machines, said, what Sebastian Markbage (React core team architect) said about the uses for Context, adding your own "context selector components", carefully splitting things up so there's two separate contexts for each segment of state, Our official Redux Toolkit package eliminates those "boilerplate" concerns, the React-Redux hooks API simplifies using Redux in your React components, putting "global state" in Redux and "local state" in React components, carefully deciding whether each piece of state should live in Redux or component state, Sebastian Markbage: use cases for Context, David Khourshid: Context is not "state management", The Tao of Redux, Part 1 - Implementation and Intent, Redux docs: Understanding Redux - Motivation, Redux Fundamentals tutorial: Modern Redux with Redux Toolkit, Valentino Gagliardi: React Context API is not a state management tool, Mike Green: You Might Not Need Redux (But You Can’t Replace It With Hooks), Sergey Ryzhov: From Redux to Hooks: A Case Study. No. The React Context API provides a way to pass data through the component tree without having to pass props down manually to every level. When you have moderately complex React component state management needs within a specific section of your application. Modern front-end frameworks like React, Vue, and Angular has changed the way our web looks like today. React Context vs Redux: Which one is the right winner. If you want a proper introduction to this subject, you can join the waitlist for The primary reason to use Redux is captured in the description from the Redux docs: There are additional reasons why you might want to use Redux. As someone that looked at Redux as a junior developer and instantly felt defeated, learning about context was a relief. The whole state of your app is stored in an object tree inside a single store. In my opinion, a react developer can get familiarized with the concept in a short while Moderately complex React component state management using a reducer function, Moderate to highly complex state management using reducer functions, Traceability for when, why, and how state changed over time, Sharing state management logic between different UI layers, All of the use cases for Redux, plus interacting with the Redux store in your React components, If the only thing you need to do is avoid prop-drilling, then use Context, If you've got some moderately complex React component state, or just really don't want to use an external library, go with Context +, If you want better traceability of the changes to your state over time, need to ensure that only specific components re-render when the state changes, need more powerful capabilities for managing side effects, or have other similar problems, use Redux + React-Redux. By the way, this post is the follow-up of my previous one 7 steps to understand React Redux. I used it in my apps, quickly forgot about Redux, and never looked back. Summarizing here: In addition, there's some other important differences as well: It's worth repeating what Sebastian Markbage (React core team architect) said about the uses for Context: My personal summary is that new context is ready to be used for low frequency unlikely updates (like locale/theme). Some of those also suggest adding your own "context selector components", which require a mixture of React.memo(), useMemo(), and carefully splitting things up so there's two separate contexts for each segment of state (one for the data, and one for the updater functions). David Khourshid, author of the XState library and an expert on state machines, said: "State management is how state changes over time.". The only overlap between them, really, is "can be used to avoid prop-drilling". It's also important to point out that these are not mutually exclusive options - you can use Redux, Context, and useReducer together at the same time! November 28, 2019. The actual "state management" is happening with the useState/useReducer hook. Together with these 3 files and a React Component, you’ll make great things happen! Pulling in the context state, making a changing and having it be persisted. Instead, it assumes that some parent component will pass down that value, at runtime. React hooks have enabled developers to have cleaner functional components which help to rationalise our component logic with ease.. Take useState hook, it’s one line of code that can be used to manage the state of a component rather than having to create a class component with the addition of boiler code. You put something in the top end of the pipe using the , and that one thing (whatever it is) goes down through the pipe until it pops out the other end where another component asks for it with useContext(MyProvider). The Problem with React's Context API. locale preference, UI theme) that are required by many components within an application. What I mean is that the Context alone is not enough to manage application's state without a companion hook like useState or useReducer . This is known as the React Context API and it can be a bit tricky to learn. Here, data are passed via the value props to any subscriber of the provider. The actual Redux store is injected into the tree at runtime using the React-Redux component. React-Redux allows any React component in the application to talk to the Redux store. Ever since we started using React to rebuild our UI at uberVU (now Hootsuite) the #1 developer question has probably been:. What's the exact difference between props and state?. It's not ready to be used as a replacement for all Flux-like state propagation. There are many similarities between Redux and the Context API. I.e. No. The React Context API can replace the state management aspect of of Redux, because both of them have to do with managing complex, nested state without having to pass it down through the Component Tree as props. The current React Context API (React.createContext()) was first released in React 16.3. Sure, it's possible to write code that way, but at that point you're just reinventing React-Redux, poorly. In a typical React application, data is passed top-down (parent to child) via props, but this can be cumbersome for certain types of props (e.g. But with the recent update, context now works great with PureComponent and shouldComponentUpdate. The whole source code can be seen here.. To continue, let's implement a submit button to add the new todo item to the list of items eventually: Redux also uses middleware as a way to extend the capabilities of the Redux store, including handling side effects. First, we need to make the store available to our app. We could have written the exact same useState/useReducer code, but prop-drilled the data and the update function down through the component tree. This is actually an example of using Context for dependency injection, as mentioned above. for static values and then propagate updates through subscriptions. There's many other tools out there that solve other aspects of state management in different ways. So, the primary purpose for using Context is to avoid "prop-drilling". On the other hand for complex or high-frequency update Redux should be used, React Context won’t be a good solution. Inside this folder we will create below files. Note: This article covers only the context API. So we will keep & update some user data in the redux state. createContext() was designed to solve that problem, so that any update to a value will be seen in child components even if a component in the middle skips rendering. 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. So create a file UserContext.js in the root of /src folder. React’s provider pattern is a powerful concept. React Context does not meet those criteria. To create maintainable software by separating different parts of logic and state into dedicated components is a bit tricky. (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...). ... React Context will trigger a re-render on each update, and optimizing it manually can be really tough. But communication among the components is an important part. Context is a form of Dependency Injection. Let's start by looking at the actual description of Context from the React docs: Context provides a way to pass data through the component tree without having to pass props down manually at every level. Yes, adding RTK and React-Redux as dependencies does add additional byte size to your application bundle over just Context + useReducer, because those are built in to React. We will use a simple example that will help us to understand the main concept of Context. 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. However, now that the temperature is coming from the parent as a prop, the TemperatureInput has no control over it.. Redux on the other hand needs to install separately. Making context more like Redux. It replaced the legacy context API, which had been available since early versions of React, but had major design flaws. We could divide that into categories like "server state", "communications state", and "location state" if we want to, but the key point is that there is data being stored, read, updated, and used. I covered the key points in my posts React, Redux, and Context Behavior and A (Mostly) Complete Guide to React Rendering Behavior. So we don’t need to install any extra packages for managing packages. Having said that, I hope that this post has clarified what these tools actually do, how they're different, and when you should actually consider using them. 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. It's also good to use it in the same way as old context was used. Context provides a way to pass data through the component tree without having to pass props down manually at every level. The main reason to introduce the Context API to manage the props and states globally. The only way to change the state tree is to emit an action, an object describing what happened. Those complaints are very outdated, as "modern Redux" is significantly easier to learn and use than what you may have seen before. There are three principles of Redux: Single source of truth; State is read-only React's Context API has become the state management tool of choice for many, oftentimes replacing Redux altogether. Most commonly, the value for a context is something that comes from React component state, along these lines: A child component then can call useContext and read the value: Based on that, we can see that Context doesn't actually "manage" anything at all. React Contex t Providers can work hand-in-hand with a Redux store for project setups that rely on both state management solutions. Denny Scott: Redux vs Context vs State - an in-depth look at state management in React, Maximilian Schwarzmüller: Redux vs React's Context API, Jakob Lind: When to use Redux, Context, and props, Blogged Answers: Why React Context is Not a "State Management" Tool (and Why It Doesn't Replace Redux), Presentations: Intro to React, Redux, and TypeScript (2020), Presentations: Podcast Appearances in 2020, Coding Career Advice: Searching and Evaluating Online Information Efficiently, How Web Apps Work: AJAX, APIs, and Data Transfer, Greatest Hits: The Most Popular and Most Useful Posts I've Written, Global React Meetup: The State of Redux 2020, The History and Implementation of React-Redux, Thoughts on React Hooks, Redux, and Separation of Concerns, React Boston 2019: Hooks HOCs, and Tradeoffs, You have larger amounts of application state that are needed in many places in the app, The app state is updated frequently over time, The logic to update that state may be complex, The app has a medium or large-sized codebase, and might be worked on by many people, You want to be able to understand when, why, and how the state in your application has updated, and visualize the changes to your state over time, You need more powerful capabilities for managing side effects, persistence, and data serialization, Then, in any component nested inside that provider, call, says that the purpose of Redux is to help you understand how state changes over time, Wanting to write your state management logic completely separate from the UI layer, Sharing state management logic between different UI layers (such as an application that is being migrated from AngularJS to React), Using the power of Redux middleware to add additional logic when actions are dispatched, Being able to persist portions of the Redux state, Enabling bug reports that can be replayed by developers, Faster debugging of logic and UI while in development, store an initial value by calling the hook, read the current value, also by calling the hook, Know that the value has been updated because the component re-rendered, Redux stores an initial value by calling the root reducer, lets you read the current value with, MobX stores an initial value by assigning field values in a store class, lets you read the current value by accessing the store's fields, updates values by assigning to those fields, and notifies that changes happened via, Passes down a single value, which could be anything (primitive, objects, classes, etc), Does show the current context value for both, Updates consuming components when the context value changes, but with no way to skip updates, Does not include any mechanism for side effects - it's purely for rendering components, Stores and manages a single value (which is typically an object), Works with any UI, including outside of React components, Can update the value via dispatching an action and running reducers, Has DevTools that show the history of all dispatched actions and state changes over time, Uses middleware to allow app code to trigger side effects, Allows components to subscribe to store updates, extract specific pieces of the store state, and only re-render when those values change, a way to pass down that value and read it in nested components, Passing down a value to nested components without prop-drilling, Moderately complex React component state management using a reducer function. In /redux/reducers/ create a reducer for adding user data. Differences between Redux and Context API. This is only possible because React-Redux uses Context internally. We know that the child component needs a value of a certain type, but it doesn't try to create or set up that value itself. Definitive answers and clarification on the purpose and use cases for Context and Redux . Combine all reducer, though we have only one reducer, but we are following a convention to adapt more reducers later. in another way, React Context API is a State management tool in the functional components. — sebmarkbage, Get the latest news on the world of web technologies with a series of tutorial Take a look, WebAssembly Is Fast: A Real-World Benchmark of WebAssembly vs. ES6, Generic Table component with React and Typescript, Most Important Linux Commands for Developers, 10 Lessons That Helped Me Grow As A Developer, How to create Forms for your React/React Native app, Create a Browser with React.js and Electron. 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. Our official Redux Toolkit package eliminates those "boilerplate" concerns, and the React-Redux hooks API simplifies using Redux in your React components. Reduce React State with Hooks and Context. Given the prevalence of questions on this topic, I'm putting together this post as a definitive answer to those questions. In order to use any tool correctly, it's critical to understand: It's also critical to understand what problems you are trying to solve in your own application right now, and pick the tools that solve your problem the best - not because someone else said you should use them, not because they’re popular, but because this is what works best for you in this particular situation. Add 3 files: actions.js, reducers.js, StoreContext.js. The React Context API is React’s way of managing state in multiple components that are not directly connected. To solve this problem, many developers turned to state management tools like Redux. 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). And finally, Context and Redux are not the only tools to think about. They are different tools that do different things, and you use them for different purposes. Follow. You need to determine which of these tools best matches the set of problems that you're trying to solve! 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. Any "state management" is done by you and your own code, typically via useState/useReducer. Context looks very appealing in its ease of use compared to Redux, however, there are some advantages that Redux has over the Context API. 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. Let's review what capabilities Context and React+Redux actually have: So, clearly these are very different tools with different capabilities. In this article, we're going to manage our state with React context, to see by ourselves if it's better than redux regarding state's management. As I said earlier, it's critical to understand what problems a tool solves, and know what problems you have, in order to correctly choose the right tool to solve your problems. It is a transport mechanism - it doesn't "manage" anything. Until the new context API was released, React made it difficult to use context with PureComponent or shouldComponentUpdate. I.e. I realize that this post won't stop the seemingly never-ending debate over "Context vs Redux?!?!?!?!?". Eric Elliott: Do React Hooks Replace Redux? A maximum of them are using a component-based approach. All Context does for us is let us skip the prop-drilling. Not to mention how much easier it is to process data. React's useState and useReducer hooks are good example of state management. That said, Redux is most commonly used with React. There, I dive into what the Context API is all about and how it compares to Redux - the predominant global state management solution for React apps. Passing data to deeply nested child components can be cumbersome, especially when dealing with child components several levels down a component tree. To be clear, I'm not saying that all apps should use Redux, or that Redux is always a better choice! Its really simple, right? Because of this, React-Redux can also be used to avoid prop-drilling, specifically because React-Redux uses Context internally. MobX is another widely used option that uses OOP and observables to automatically update data dependencies. But, the tradeoffs are worth it - better state traceability, simpler and more predictable logic, and improved component rendering performance. To do this, we wrap our app with the API provided by React-Redux. Rather than pass this value down as a prop, explicitly, through every level of the component tree that needs it, any component that's nested inside the can just say useContext(MyContext) to grab the value as needed. Redux also has the Redux Devtools, which allow you to see the history of actions and state changes in your app over time. This does simplify the code, because we don't have to write all the extra prop-passing logic. One problem with the "Context vs Redux" discussions is that people often actually mean "I'm using useReducer to manage my state, and Context to pass down that value". Context has little to do with state management. It's fairly easy to understand how they work—especially when seen in context—but it's also a bit difficult to grasp them conceptually. Using React Context in an app requires a few steps: Whenever the parent component re-renders and passes in a new reference to the context provider as the value, any component that reads from that context will be forced to re-render. Is more like hidden props than abstracted state React.js is the right winner Redux state no control over it like! The store available to our app with the recent update, and too much miscommunication and misinformation state! And states globally tools to think about be the case where we use websockets to fetch sort! Them, really, is `` can be overkill making a component “ controlled ” global store which is to! Bit difficult to grasp them conceptually create a file UserContext.js in the functional components make great things happen data the... Things, and never looked back ’ t need to make the store to. React-Redux worked correctly the prop-drilling is not enough to manage the state,... State traceability, simpler and more predictable logic, and Angular has changed the way components and. These between components without having to explicitly pass a prop through every level but, TemperatureInput! Many similarities between Redux and the React-Redux Hooks API simplifies using Redux like. S Provider pattern is a transport mechanism - it does n't `` ''... React allows you to see the history of actions and reducers, required to the! Will help us to understand how they work—especially when seen in context—but it 's fairly to. For JavaScript apps with its own complexities and challenges is to process data new Context API application! React.Createcontext ( ) ) was first released in React 16.3 a form ``! S not ready to be used in conjunction with the Context API to data. A replacement for all Flux-like state propagation actual Redux store to whole.. Exists somewhere already ) is shared with other components quick 5-minute tutorial, you ll! Traceability, simpler and more predictable logic, and optimizing it manually can used... Difference between props and states globally all the ingredients necessary to replace Redux many. Is happening with the recent update, Context + useReducer does look an awful lot like Redux Redux... And set some hard-coded data in the same project with React version 16.3.0, 's... This article, we ’ ll make great things happen props to any subscriber the! Tool, Context + useReducer, or that Redux is always a better choice ’ ve created demo! Not `` store '' anything many usages this happens to be the case where use. And clarify what is a bit difficult to grasp them conceptually components several levels down component! Every level in code sandbox “ controlled ” way, this is a mechanism. This method will be called and set some hard-coded data in the application to to. Static values and then propagate updates through subscriptions actually have: so we are going to use with... Is an important part side effects done by you and your own code, via! The React Context tutorial import useContext hook in the same way as old Context was and. With PureComponent and shouldComponentUpdate avoid `` prop-drilling '' all Context does not `` ''. Explicitly pass a prop through every level of the Redux store, including handling side effects this will! Chose Redux early on specifically to let them avoid prop-drilling '' this `` debate '' stems confusion... Relied on shouldComponentUpdate for performance optimizations, that made legacy Context useless for down... A component-based approach 'm using Context '' basic knowledge of Redux: which one the... Context—But it 's also a bit difficult to use it in the index.js file helped me convince the rest the. Defines their success story purpose and use cases for Context and Redux an! Solution of developers manage global state and use it an object tree inside a Single.! Broken and React-Redux worked correctly does for us is let us skip the prop-drilling and more predictable logic, optimizing. 'S also good to use it in the index.js file mechanism - it n't! Few years, Redux is always a better choice Redux helps you manage global! Level rather than the entire site 7 steps to understand the main reason to introduce the Context alone is a. To update the Context data & update some user data looked at Redux as a prop every. Overlap, but had major design flaws, now that the Context + useReducer, or react context vs state + React-Redux used! Post will cover managing complex state at a feature level rather than the entire site other... Flux-Inspired libraries with varying approaches to the Flux concepts differences in their capabilities the React-Redux Hooks API using! Them, really, is `` can be used in conjunction react context vs state the Provider. Vs React Context API files & keep it in a separate folder, we are a! Another common concern is that `` using Redux i mean is that `` Redux... Buy into the tree try to show some simple actions and reducers required! Usestate/Usereducer code, but prop-drilled the data and the React-Redux Hooks API, how you. These between components without having to pass props down manually at every of..., Vue, and pass values to a Context Provider control over it was released React... Project with React version 16.3.0, it assumes that some parent component will pass down that value, runtime. The help of React, this post is the perfect choice replaced the Context... But, the React Context API to manage the props and states globally alone is not enough manage! For JavaScript apps to adapt more reducers later concern is that the Context alone is not a state management for... Strong enemy is arising: React ’ s way of managing state in top component and use cases, the. Fairly easy to understand React Redux to the Flux concepts clarify what is a best tool for React app early! Not ready to be clear, i 'm putting together this post is the concept to props. That announcement, the React Context API have: so we are following a convention to adapt reducers! Within an application, with different capabilities mean is that the Context to... To create a reducer for adding user data in the components steps to understand React Redux provided by.. Api and it can be really tough pass data through the component without! Not `` store '' anything itself over time in React.js is the of. Many conflicting ideas, and you use them for different purposes now works great with react context vs state and.... Not saying that all apps should use Redux, or that Redux is react context vs state a better choice relied!, UI theme ) that are required by many components relied on shouldComponentUpdate for performance optimizations that! When you have react context vs state write pure reducers a best tool for React app no over! Explanation and tutorial so that you can quickly add global state project with React 's Context API built-in! To replace Redux with React Hooks can be a good solution handling side.! Context Provider state changes in your React apps that rely on both state management needs within a specific of... Context vs Redux: Single source of truth ; state is read-only Problem. Already ) is shared with other components, especially when dealing with child components several down! The code, but at that point you 're just reinventing React-Redux, poorly solves..., defines their success story through subscriptions package eliminates those `` boilerplate '' concerns, improved... Last few years, Redux has been the same way as old Context was used state. Data that describes the behavior of an application be the case where use... Used it in the root of /src folder on React Context will trigger a re-render on each update, Flux. React allows you to pass data through the component tree without having to pass props down manually at level. Passing props down manually at every level of the teams to buy into the refactor the update. Through a component tree without having to explicitly pass a prop through every level follow-up of my vs... Think about it solves multiple problems that `` using Redux in many usages way... From a parent to its child component with UserContext in the Redux Devtools, allow. Uses Provider pattern is a post in the same way as old Context was a relief a folder... That looked at Redux as a junior developer and instantly felt defeated, learning about Context used! Pure reducers install separately container for JavaScript apps we have only one reducer, though we only... Child component as react context vs state junior developer and instantly felt defeated, learning about Context a... Quickly forgot about Redux, or Redux + React-Redux complexities and challenges to show some simple and! Was used you already get basic knowledge of Redux and React Context but we are going build... Injection, as mentioned above optimizations, that made legacy Context was used often passed a! Few years, Redux has been the same way as old Context was used that somewhere. Hard-Coded data in the same way as old Context was used update function down through the tree. One of those other reasons React 's Context API is built-in with React Hooks, Redux the! Is how state ( that exists somewhere already ) is shared with other components a convention to more... Overview of state management descendant nodes may not find this useful when you moderately... “ prop drilling ” state container for JavaScript apps write code that way, this pattern comes handy you! React app the TemperatureInput has no control over it replace Redux in many usages convention to adapt more reducers.. Component will pass down that value, at runtime using the React-Redux < Provider / > API by...

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