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    JS react developer – 20 questions for a job interview

    JS react developer – 20 questions for a job interview

    A Javascript React Developer job is interesting because it is a rapidly growing and in-demand field with many opportunities for career advancement. React is a widely-used and highly popular JavaScript library for building user interfaces, which means that as a React developer, you would have a valuable skill set in high demand. Additionally, the React ecosystem is constantly evolving and improving, which means that you would always have the opportunity to stay up-to-date with the latest technologies and best practices.

    In the Javascript Engineer role, you would have the opportunity to work on complex and challenging projects, using cutting-edge technologies to create innovative and intuitive user interfaces. You would have the ability to work with a team of developers, designers, and other experts to build world-class applications and digital experiences.

    Additionally, being a React developer allows you to be at the forefront of the technology, as React is being used by many popular companies and startups all over the world. This means that as a Javascript React developer, you would have the opportunity to work on projects that have real impact and reach a wide audience.

    React job interview questions

    Here are 20 most popular questions for a Senior React Javascript Developer:

    1. What is React Fragment? ​
    2. How do you handle state management in your React applications?
    3. Can you explain the concept of virtual DOM in React?
    4. Have you worked with any other frontend frameworks or libraries, and how do they compare to React?
    5. Can you explain the concept of Higher-Order Components (HOC) in React?
    6. How do you optimize the performance of a React application?
    7. What does the term “React context” mean?
    8. How do you handle asynchronous data loading in React?
    9. Can you explain the role of Redux in a React application?
    10. Have you worked with React Router before? How do you handle client-side routing in your React applications?
    11. Can you explain the concept of server-side rendering in React?
    12. Have you ever used any libraries such as MobX or Apollo Client for state management?
    13. Can you explain the concept of PropTypes in React?
    14. Can you explain the concept of hooks in React?
    15. Have you ever worked with libraries such as Material-UI or Semantic UI for UI styling?
    16. Can you explain the process of deploying a React application?
    17. Have you ever worked with libraries such as Formik or Final Form for form handling?
    18. Can you explain the concept of Portals in React?
    19. How do you approach debugging and troubleshooting in a React application?
    20. Refs in React. Explain examples of usage.

    Addons for React

    React is a popular JavaScript library for building user interfaces, and there are many addons available that can help you with your day-to-day work as a React developer. Here are a few of the most popular and useful tools / libraries:

    • Create React App (CRA): This is a command-line tool that helps you set up a new React project quickly and easily. It includes a development server, a build tool, and a configuration for ESLint and other linting tools, which can save you a lot of time.
    • React Developer Tools: This is a browser extension that allows you to inspect and debug your React components. You can see the component hierarchy, view the props and state of each component, and even make changes to the state directly in the browser.
    • Next.js: This is a JavaScript framework that is built on top of React. It helps you build server-rendered React applications, which can improve performance and SEO. Next.js also provides a development environment that is similar to Create React App, and it allows you to easily set up routing, code splitting and other features that can be useful in your day-to-day work
    • React Router: This is a library that allows you to easily set up client-side routing for your React applications. It makes it easy to switch between different views in your application based on the URL.
    • Formik: This is a library that helps you to handle forms in your React applications. It makes it easy to create forms, validate input, and manage form state, which can save you a lot of time when building forms.
    • Redux: This is a library that helps you manage the state of your application. It makes it easy to update the state of your application and keep your components in sync with that state, which can make it easier to reason about the logic of your application.
    • Styled-components: This is a library that allows you to create CSS style and components at the same time, it is really helpful to keep the styling of the components and the components itself in the same place, and also it allows dynamic styling based on the data that it passed to the components.

    Overall, the Javascript React Developer job is interesting because it offers a challenging and exciting career in a growing field, with opportunities to work on innovative projects, learn new technologies, and advance your career. So, if you’re passionate about technology and enjoy solving complex problems, a career as a Javascript Engineer would be a great choice.

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