React‘s useContext hook is a built-in function that allows you to consume data from a React context in functional components. Context provides a way to pass data through the component tree without having to pass props down manually at every level.
To use useContext, you first need to create a context using the React.createContext() function. This function returns an object that contains a Provider component and a Consumer component. The Provider component is used to provide data to the component tree, while the Consumer component is used to consume the data.
Here’s an example of how you might use useContext to consume data from a context:
import React, { createContext, useContext } from 'react';
const MyContext = createContext();
function App() {
return (
<MyContext.Provider value="Hello, world!">
<MyComponent />
</MyContext.Provider>
);
}
function MyComponent() {
const data = useContext(MyContext);
return (
<div>
<p>{data}</p>
</div>
);
}
In this example, we first create a new context using the createContext function. We then declare an App component that provides data to the context using the Provider component. The data we are providing is a string, “Hello, world!”.
We then declare a MyComponent component that consumes the data from the context using the useContext hook. The useContext hook takes the context object as its argument and returns the current context value.
Finally, we render the context data using the data variable in the MyComponent component.
When the MyComponent component mounts, it uses the useContext hook to consume the data from the context. The component then re-renders with the context data.
useContext is a powerful hook that allows you to consume data from a context in functional components. By using it, you can write cleaner and more concise code that is easier to understand and maintain.
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