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React Interview Guide

React Interview Guide

By : Sudheer Jonna, Andrew Baisden
4.3 (6)
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React Interview Guide

React Interview Guide

4.3 (6)
By: Sudheer Jonna, Andrew Baisden

Overview of this book

Are you struggling with React job interviews, feeling hindered by the lack of knowledge or confidence? Look no further than the React Interview Guide. Complete with the latest features of the React library, this comprehensive solution will assist you in taking a definitive step forward in your career as a React developer. This book systematically covers frequently asked questions and common edge cases encountered in React interviews. It goes beyond React to encompass other essential technologies in the React ecosystem, including routing, CSS, testing, and building Next.js apps. You’ll benefit from invaluable expert guidance, enabling you to address a wide range of React ecosystem questions swiftly as this book prioritizes interview readiness, sparing you the need to dwell excessively on individual topics before technical discussions. By the end of this book, you’ll be thoroughly equipped to excel in any React interview, giving you an edge over your peers and significantly increasing your chances of securing your dream job.
Table of Contents (19 chapters)
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1
Part 1: Getting Ready for Interviews
3
Part 2: Mastering the Core React Technical Interview
8
Part 3: Going Beyond React and Advanced Topics
13
Part 4: Hands-On with Programming Tasks

Accessing DOM nodes using ref Hooks

Refs are useful when you need to work with external systems (or non-React systems) such as built-in browser APIs. There are two built-in ref Hooks available in function components. The useRef Hook is used to declare a ref to hold any kind of value but is mainly used for DOM nodes. useImperativeHandle is used to expose the customized ref with only the required methods.

Please note that an introduction to refs has already been covered in Chapter 2. In this section, we will go beyond what we have already discussed about refs in Chapter 2.

How do you avoid recreating the Ref contents?

The useRef Hook accepts the initial value (or default value) as an argument, like the useState Hook. The declaration of this Hook should be placed at the top of the enclosed component.

React saves this initial value at the first render and ignores it for the next renders, but if you create an expensive object for the initial value of the ref, it might be called...

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