TL;DR
- Take a 20-question React interview quiz with instant explanations
- Covers JSX, Virtual DOM, components, lifecycle, hooks, and Flux
- Clarifies common confusions with Angular, Vue, and Node terminology
- Includes tips on optimization, event handling, debugging, and prop drilling
Fact Box
- The quiz contains 20 React developer interview questions.
- React advantages highlighted: SEO-friendly, Virtual DOM, reusable components, and one-way data flow.
- Component lifecycle stages listed: initialization, mounting, updating, and unmounting.
- Hooks noted as added in React 16.8, enabling state and lifecycle features without classes.
- Prop drilling is discouraged; Context API is suggested to avoid passing props through unused components.
A Guide to Answering the Most Important React.JS Developer Interview Questions
Question #1. What are the major advantages of React.JS?
Take a deep breath and let the stress go, as you seem somewhat confused. Easiness to learn and virtual DOM are React.JS’ advantages, whilst usage of TypeScript and two-way data binding are Angular’s. You are near the right track, but be more attentive to the next question!
Question #2. What are the main features of React.JS you would like to list?
While all of these features are worth writing home about, they are the main features of Angular. And, also, some type of Dependency Injection is possible in React.JS, it is far from being a feature and requires lots and lots of tinkering around.
Answer #2 You are close, but no cigar on this one, as this answer is, in fact, a mix of Vue.JS’ and React.JS’ main features. Let’s clear the smog a little: both Vue.JS and React.JS use virtual DOM and to great result, we might add, but where the first uses Templates, the second goes with JSX. React.JS also does not have computed properties out of the box (also, you can compute it pretty quickly). Event Handling also differs in React.JS and Vue.JS, also they both use virtual DOM, instead of traditional one.
Question #3. What are the major disadvantages and limitations of React.JS?
Answer #1 Bravo for not being afraid to list JSX as one of the main disadvantages of React.JS, as it can be described as both a blessing and a curse. JSX can be considered a barrier, especially for new developers, as it greatly complicates the learning curve. As for the View Part, you should never forget and never shy away from mentioning the fact that React.JS only covers the UI Layers of the whole app in your interview, so the project would still need other technologies for the full toolset. And the third major React.JS’ limitation is its poor documentation, which stand from constant development, which renders full proper documentation impossible.
Answer #2 Once again, the devil is in the details. While the steepness of React.JS’ learning curve is quite significant and the speed of development is bringing its fair share of problems too, React.JS is extremely SEO-friendly.
Question #4. What are the differences between React.JS and other Java scripts?
Answer #1 Unfortunately, you are wrong on this one. All of these features differentiate not React.JS, but Node.JS. It’s also worth mentioning here that Node.JS is used for creating backend, while React.JS covers only the UI side of the question.
Answer #2 We urge you to pay closer attention. React.JS does not use TypeScript, it uses JavaScript, hence the JS in the name.
Question #5. What are the major two types of components that can be declared in React, and when should you use one over the other?
Answer #1 The descriptions of and reasoning behind choosing these components are correct, but we do not use Smart and Dumb components in React.JS. Instead, the two major types of components in React.JS are Functional and Class components.
Answer #2 You are right! Components in React basically return a piece of JSX code that tells you what should be rendered on the screen. Thus, these two component types are the ones we use.
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