Usecontext Hook(part-1) In React.js

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This blog post introduces the useContext hook in React and explains how it helps eliminate prop drilling by providing a way to share state efficiently across components. Using a step-by-step approach, it demonstrates how to create and use a Context Provider in a simple MCQ Quiz Application, where answer visibility is managed globally. Key benefits, implementation details, and best practices for using useContext are covered, setting the stage for more advanced use cases in Part 2.

Understanding the useContext Hook in React (Part 1)

In modern React applications, managing state and passing data efficiently is crucial. One common challenge developers face is "prop drilling," where props are passed down multiple levels of components, making code harder to manage. React's useContext hook, along with the Context API, provides an elegant solution to this problem. In this blog post, we will explore the basics of the useContext hook and how it helps simplify state management in React applications.

What is the useContext Hook?
useContext is a built-in React hook that allows components to access values from a ...
... Context without needing to pass props manually at every level. It provides a way to share state across multiple components in a React application.

Key Benefits of useContext:

✔ Eliminates the need for prop drilling. ✔ Enhances code readability and maintainability. ✔ Allows for efficient state sharing between components. ✔ Works well with useState and other hooks.

Creating and Using Context in React

Let's understand how useContext works by building a simple MCQ Quiz Application where each question's answer visibility is managed independently using Context API and useContext.

Step 1: Create a Context

First, we create a context using React.createContext():

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

const AnswerVisibilityContext = React.createContext();
This AnswerVisibilityContext will manage the state of whether an answer is visible or hidden.

Step 2: Create a Context Provider

A Context Provider component is responsible for managing and providing the state to its children components.

const AnswerVisibilityProvider = ({ children }) => {
const [isAnswerVisible, setIsAnswerVisible] = useState(false);

const toggleAnswerVisibility = () => {
setIsAnswerVisible(prevState => !prevState);
};

return (

{children}

);
};
Explanation:

✔ We use useState to manage the visibility state (isAnswerVisible). ✔ The toggleAnswerVisibility function toggles the answer visibility. ✔ The AnswerVisibilityContext.Provider wraps the children components to provide them access to the state.

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