There may be more use cases where Redux isn't necessary, but no, neither Hooks nor context will "kill" Redux. What is more likely to kill/replace Redux is context instead of hooks, which is a way to share state across components. It feels to me like this has become a de facto mantra of the React/Hooks crowd. Hooks just allow us to use functional components that can now hook into application state without having to turn them into class-based components. It avoids the nightmare of having a global variable that can be updated directly from dozens of different places in the app. Are there critical flaws in this approach? Managing shared state in larger React apps usually involved pulling in third-party libraries like Redux and MobX. Let's replace the import of react with an import from use-persisted-state. If Moe component (or any of them) is a tsx file, on the "onClick={global.counter.reset}" the counter give me the following error: Property 'counter' does not exist on type '{}'. You may not be too keen on the idea of using that generic, plain-ol'-JavaScript object global as a place to cache the instance of useCounter(). The short answer is "no" - sorta. It's not that you can't share state with Hooks. Thanks goes to these wonderful people (emoji key): This project follows the all-contributors specification. In a nutshell, we are doing the following: 1. It accepts a new state value and enqueues a re-render of the component. The Consumer component makes use of the renderProp function. The downside is that Context is a bit more complex and setting it up can be painful. Custom Hooks are a mechanism to reuse stateful logic (such as setting up a subscription and remembering the current value), but every time you use a custom Hook, all state and effects inside of it are fully isolated. Because it's not released yet? So a custom Hook is, by default, designed to share stateful logic, but it doesn't directly share state. Returns a stateful value, and a function to update it. they're used to log you in. However, in this example we have only one Context to keep it simple to understand. Give Sambhav Gore a like if it's helpful. // Déclare une nouvelle variable d'état, que l'on va appeler « count », // Déclare une nouvelle variable d'état, que nous appellerons « count », // Similaire à this.setState({ fruit: 'orange' }), 2. I want that component to be accessible from anywhere in the app. So if we don't want other components to have the ability to increment() the count value, that's easy. Once we have a reference to useCounter() sitting in the global object, Larry, Curly, Moe, and Curly Jr need only import that same global object to reference the state values and the functions made available through useCounter(). If they're going to truly share state, then they need to also share the same call to that custom Hook. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Features Persists the state to localStorage Similarly, UserDetails and AddUser Components make use of the useContext hook in to display the selected user's details, and to add a new user, respectively. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. Work fast with our official CLI. Our final app will look like this: Let’s start by explaining RxJS. To be completely honest, this approach feels really good to me. Individual components make use of useContext hookto get the value from the context. We also have Curly's child - Curly Jr. So when, for example, Larry updates count with increment(), Curly, Moe, and Curly Jr are all oblivious to the fact - because their isolated versions of count have not been updated at all. Now, with the useState (), we can do it. Learn more. In the past you had to use Redux to make sure a state is persistent between each re-render of the component. React Hooks with Redux persisting the App state, How to pass data from state in redux to a react hook state. By using Context we are sharing state between multiple components without explicitly passing a prop through every level of the tree. This does not mean that all of the downstream components in levels 2-10 will be updated/rebuilt in any way. Learn more. We use essential cookies to perform essential website functions, e.g. The others are unchanged. Required: optional So far, what I understood is hooks are good for stateful functional components, what about shared state? You can use useEffect() instead of React lifecycle methods, and you can use useReducer to write quick action creator methods and access a global state!! You could also combine multiple contexts and useReducer hooks but it might be cleaner to just use Redux. In this implementation, the count variable can only be updated in the useCounter() custom Hook. C’est pourquoi nous préférons plutôt utiliser la déstructuration positionnelle. and an optional storage provider (default = localStorage) and returns a hook Cependant, lorsque l’on modifie une variable d’état sa valeur est remplacée et non fusionnée, contrairement à this.setState dans les classes. There's also a whole learning and tooling ecosystem built around Redux that context doesn't have at the moment as far as I know. But probably will do so when released? For large apps I don't think just one context and useReducer will be sufficient. As seen above, the value passed in props becomes the initial value in the context. We're a place where coders share, stay up-to-date and grow their careers. Hacking React Hooks: Shared Global State The Problem. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. When Larry's "Increment" button is clicked, the change is seen on everyone. (A working example of the following code can be seen here: https://stackblitz.com/edit/custom-hooks-shared-state). We strive for transparency and don't collect excess data. Curly tried to get cute by simply doing: But that has no effect. Before Hooks, functional components had no state. Let’s say that some components don’t care about that single state property. Now all of the descendants of this Provider can make use of the useContext hook as explained below. Ça signifie que nous créons deux nouvelles variables fruit et setFruit, avec fruit qui reçoit la première valeur renvoyée par useState, et setFruit qui reçoit la deuxième. Contribute to kelp404/react-hooks-shared-state development by creating an account on GitHub. Was AGP only ever used for graphics cards? But IMO context isn't as powerful as Redux stores as there are other features that Redux offers besides a shared state store such as middlewares and a specialized devtool with time-travelling capabilites. No. This page describes the APIs for the built-in Hooks in React.

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