In order to consume this global state, we opted for creating a custom hook that exposes both state and dispatch in a single call: const useGlobalState = () => [ React.useContext(GlobalStateContext), React.useContext(DispatchStateContext) ]; So, accessing global state from a … However, we could go a bit further and build a more flexible solution as most of your scenarios will require to not only consume global data but also modify it. The following approach is built on top of Daishi Kato's react-tracked, a library which is only 1.5kB and has superb performance, aimed to deal with complex objects in context without the hassle of unnecessary re-renders. Now, we could re-write our Counter example like this: And Counter would only re-render whenever state.num is updated, ignoring the rest of the properties in our global state. Creating a global state in React is one of the first signs that you may need Redux (or another state management library such as MobX) in your application, because in React the local state is located on a component level. Actually, this is the exact reason why Redux dropped their experimental approach of using direct React context. Wrap your components with gs. With the release of context API in React 16.3 and especially hooks in React 16.8, a new world of possibilites suddenly arose. In this article we assume that you are already familiar with React Hooks, we will make use of useReducer, useCallback, In this post, we are going to show you the main issues of this pattern and a few different approaches to achieve global state using React native features. It will provide us with a single and constant dispatch method to trigger global state updates. Finally, we have presented a few implementations to overcome this problem by either splitting context, blocking undesired re-renders with containers or relaying in a third party solution. If storing everything in a monolith context is problematic, let's split context separating unrelated data. We have compiled the demos source code from this post in the following Github repo: global-state-react, Application State Management with React: https://kentcdodds.com/blog/application-state-management-with-react, Github facebook/react discussion, Provide more ways to bail out inside Hooks, React tracked library: https://github.com/dai-shi/react-tracked. Hence you cannot have a real global state in React. In order to consume this global state, we opted for creating a custom hook that exposes both state and dispatch in a single call: So, accessing global state from a component can be as easy as this: Of course, it is important to note that this is not the only valid implementation to accomplish global state within React and you may have your own. https://kentcdodds.com/blog/application-state-management-with-react, Provide more ways to bail out inside Hooks. Yes I know, this wouldn't be a 100% native solution, but it provides performance and ease of use at a minimum cost, so it's worth checking it out. This is great! Just wrap your app within a context provider and feed that provider with the data you want to make global: Consumption of this data is a piece of cake thanks to the hooks: just retrieve your state by using useContext hook wherever you need it: In the previous example we just did a basic approach: consuming a static global state.
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