re: Unpopular opinion? I don't do puzzle coding tests. VIEW POST


Hi, I am currently in the process of applying to front end developer jobs focused on React. How do you suggest I prepare for the interviews from your experience? Thank you!


I'd say it's good to practice some questions about libraries that are usually used, for example React Router, Redux, redux-saga. Also prepare yourself to answer the more popular questions like: What is the difference between the Virtual DOM and the DOM; What common patterns are used and why (HOC is one of them).
Maybe they'll also ask about the lifecycle methods of a component, so they might ask "Can I make an HTTP request inside a component's constructor"?

Some questions to keep in mind:

  1. How does React rendering work?
  2. How do we cancel a fetch HTTP request, in order to prevent setting state on an unmounted component?
  3. What does the render() method from React.Component return? (this shows that you know the difference between a React component and a React element)
  4. What is babel and webpack used for in a React application?

I'd advise that you look up React Hooks if you haven't yet. That might be a topic they want you to know.

Here are some resources you might find useful:


Thank you for taking the time to reply to my comment! I will definitely check these resources out and make sure I know the questions mentioned for my next interview. Thank you!


I'm currently interviewing frontend developers for React jobs. There are a few things I look for:

  • Current knowledge - make sure you can implement hooks in a functional component and not just class based components.
  • Be able to spot instances where components can be refactored, either to extract reusable functionality or to replace two or more repetitive components with one configurable component.
  • And the best thing to show: TESTING! Exactly zero candidates so far have shown me how they would test their React app. Any effort you put into this is very likely to make you stand out.



Maybe a typo, but you can't use hooks in class components. Or maybe you mean making lifecycle methods with hooks in functional components?

I love your second test, that's great.

Indeed, that wasn't clear - what I look for is for candidates to be able to take stateless functional components and implement functionality using hooks. Many immediately convert to class components in order to use lifecycle methods.

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