Get to Know React's New Context API

React's Context API had undergone some changes and improvements. However, please note that developments in technology can occur rapidly, and there may be further updates or changes after my last training data in 2022.

React's Context API is a feature that allows you to share values like themes, user authentication status, or any other global state across your React component tree without having to pass props manually at each level. The Context API has been around for a while, but React 16.3 introduced a new API for working with context.

Here are the key concepts and changes introduced with React's new Context API:

  1. React.createContext:

    In the new Context API, you use the React.createContext function to create a context. This function returns an object with Provider and Consumer components.

                    
                        const MyContext = React.createContext();
                    
                

  2. Context.Provider:

    The Provider component is used to wrap the part of your component tree where you want to make the context available. It takes a value prop that will be passed down to the consuming components.

                    
                        <MyContext.Provider value={/* some value */}>
                        {/* Your components here */}
                      </MyContext.Provider>                  
                    
                

  3. Context.Consumer:

    The Consumer component is used to consume the context value. It should be used within the render prop pattern to access the context value.

                    
                        <MyContext.Consumer>
                        {value => /* render something based on the context value */}
                      </MyContext.Consumer>                  
                    
                

  4. useContext Hook:

    React provides a useContext hook that allows functional components to subscribe to context changes without using the Consumer component. This hook simplifies the code for consuming context values in functional components.

                    
                        const value = useContext(MyContext);
                    
                

Example:

        
            import React, { createContext, useContext } from 'react';

            // Create a context with a default value
            const MyContext = createContext('default value');
            
            const ParentComponent = () => (
              <MyContext.Provider value="Hello from Context!">
                <ChildComponent />
              </MyContext.Provider>
            );
            
            const ChildComponent = () => {
              // Consume the context value using useContext hook
              const contextValue = useContext(MyContext);
            
              return <div>{contextValue}</div>;
            };
            
            export default ParentComponent;            
        
    

Important Note:

Remember that the context should be used judiciously. Overusing it can lead to a complex and hard-to-understand component hierarchy. It's best suited for values that are truly global and don't change frequently.

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