The Context API in ReactJS is a powerful feature that allows developers to manage and share global state across an entire React application without having to pass props down manually through every level of the component tree. This is particularly useful for data that needs to be accessible by many components at different nesting levels, such as user preferences, theme data, or authentication status.
Key Features of Context API
Avoids Prop Drilling: Prop drilling is a common issue in React applications, where data needs to be passed through many layers of components not directly involved in the data consumption. Context API solves this by providing a way to share values between components without having to explicitly pass a prop through every level of the component tree[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].
Simplifies Component Structure: By using Context, components can access shared data directly using the useContext hook or the Consumer component. This simplifies the component structure and improves code readability and maintainability[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].
Efficient Updates: Context API is optimized to ensure that only components that depend on the context data get re-rendered when the context data changes. This helps in preventing unnecessary renders and can lead to performance improvements in large applications[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].
How It Works
CreateContext: You start by creating a Context object using the React.createContext() method. This method returns a Context object that includes a Provider and a Consumer component[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].
Provider Component: The Provider component is used to wrap the part of your application that needs access to the context data. It accepts a value prop that will be available to all the component's consumers[1][2][3][4][5][6][7][8][9][10]...
