What is your experience with JavaScript?
This is a basic question to gauge the candidate's experience with JavaScript. You can ask about their years of experience with the language, the projects they have worked on, and any notable achievements. It's also good to ask about their experience with specific JavaScript frameworks or libraries such as React or Vue.
How do you keep up with the latest trends and updates in JavaScript?
JavaScript is constantly evolving, with new updates and trends emerging regularly. A great JavaScript developer should be current with these trends and updates. Ask about the resources they use to stay updated, such as online communities, blogs, or conferences.
Can you explain closures and how they work in JavaScript?
Closures are a fundamental concept in JavaScript, and any skilled developer should understand them well. This question will help you assess the candidate's knowledge of the language and their problem-solving skills. They should be able to explain closures and give examples of how they have used them in their previous projects.
Have you worked with any front-end frameworks before?
JavaScript frameworks such as React and Angular are popular choices for building front-end applications. Ask the candidate if they have experience working with any of these frameworks and their level of expertise. You can also ask about their experience with other front-end tools, such as CSS preprocessors or bundlers.
How do you approach debugging and troubleshooting in JavaScript?
Debugging and troubleshooting are critical skills for any JavaScript developer. Ask the candidate about their approach to debugging and troubleshooting, including the tools they use and any specific strategies they employ. They should be able to explain their process clearly and demonstrate their ability to solve complex problems.
Can you explain the difference between synchronous and asynchronous programming in JavaScript?
Asynchronous programming is an essential concept in JavaScript and is used extensively in web development. The candidate should be able to explain the difference between synchronous and asynchronous programming and provide examples of when to use each. They should also be familiar with JavaScript's built-in functions, such as setTimeout() and setInterval().
Have you worked with any back-end technologies before?
JavaScript is not just limited to front-end development. There are also several back-end technologies that can be used with JavaScript, such as Node.js and Express.js. Ask the candidate if they have experience working with any of these technologies and how they integrate them with their front-end work.
How do you ensure the performance and scalability of your JavaScript code?
Performance and scalability are important considerations when building JavaScript applications. The candidate should be able to explain how they optimize their code for performance and scalability, including techniques such as code splitting, lazy loading, and caching. They should also be familiar with performance testing tools such as Lighthouse and PageSpeed Insights.
