Avoid unnecessary re-renders with React Context

React Context provides a way to pass data through the component tree without having to pass props down manually at every level.  However, when using the Context API, it's important to understand how to avoid unnecessary re-renders, which can cause performance issues and slow down the application. In this blog, I will share some tips on how to avoid unnecessary re-renders when using the React Context API.

To avoid unnecessary re-renders when updating the Context in React, you can use the useMemo hook along with the Context Provider. This allows you to memoize the value you pass down through the Context, preventing unnecessary re-renders of consumers.

Here's a step-by-step guide:

1. 1. 1. Create a Context Provider Component:

   1. First, create a Context and a Provider component. The Provider component will use useMemo to memoize the value provided to the Context.

   

   
   
   

1. 2. Wrap Your App with the Provider:

1. In your main index.js file or the component where your app starts, wrap your app with the Provider:

1. 3. Consuming Context in Components:
2. Now, you can consume the Context value using the useContext hook in your components:

1. By using useMemo, you ensure that the value provided by the Context Provider only changes when the state it depends on changes. This prevents unnecessary re-renders of components that consume this Context.
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3. Remember to replace initialState, newState, and any other placeholder values with your actual application logic.