The Ultimate ChatGPT Guide with React Native - Develop Mobile Apps - useEffect Hooks and Rendering Optimization with Re

The video tutorial introduces the useState and useEffect hooks in React, focusing on their roles in managing state and optimizing rendering. The instructor demonstrates a common issue where a comment is logged twice due to unnecessary re-renders and explains how to use the useEffect hook to address this by synchronizing components with external systems. A practical example is provided to show how useEffect can be used to control when actions are fired, improving application performance. The tutorial concludes by highlighting the power of hooks in React for application development.

What is the primary purpose of the useState hook in React?

• To manage and track the state of a component

• To style components

• To manage routing in a React application

• To handle HTTP requests

Why is it problematic if a component renders twice unnecessarily?

• It improves the user interface

• It makes the application more secure

• It doubles the computational load

• It increases the complexity of the code

What is the main function of the useEffect hook?

• To manage user authentication

• To synchronize components with external systems

• To fetch data from an API

• To handle form submissions

How can you control when the useEffect hook runs?

• By setting a timeout

• By using a loop

• By passing a second argument as an array

• By using a conditional statement

What happens when the dependency array in useEffect is empty?

• The effect runs only once after the initial render

• The effect runs every time the component updates

• The effect never runs

• The effect runs only when the component unmounts