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Javascript Engineer Interview Questions

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1,680 javascript engineer interview questions shared by candidates

Differences between variables Differences between map/filter Differences between mobx/redux Closure, bubbling, event loop React hooks React-keys Typescript: interfaces vs types, generic functions, differences between any/unknown/never JavaScript tests
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Senior Javascript Developer

Interviewed at SweetSoft

5★
Dec 12, 2022

Differences between variables Differences between map/filter Differences between mobx/redux Closure, bubbling, event loop React hooks React-keys Typescript: interfaces vs types, generic functions, differences between any/unknown/never JavaScript tests

Main benefit of React and other similar Javascript frameworks? How would you define a component? React class components versus functional components? What is virtual dom and why is it used? What is state management? Benefits and downsides of GraphQL? CSS in JS versus SCSS/CSS? Frontend SEO optimisation (Lighthouse)? How would you solve content shifting on load? Javascript testing, unit and integration testing?
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Software engineer Javascript

Interviewed at Comsysto Reply

4.5★
Jan 9, 2023

Main benefit of React and other similar Javascript frameworks? How would you define a component? React class components versus functional components? What is virtual dom and why is it used? What is state management? Benefits and downsides of GraphQL? CSS in JS versus SCSS/CSS? Frontend SEO optimisation (Lighthouse)? How would you solve content shifting on load? Javascript testing, unit and integration testing?

I applied though LinkedIn. Interview process: 1. Coding round - Front end challenge on React context, check if binary tree 2. How would you solve failed test cases in your code done in 1st round? What can you use instead of Context API? 3. Presentation on a computing project you have undertaken or are undertaking - I did 15 min presentation after which they asked me about my project. Later they presented about their current app version and future version. Few behavioral questions and asked about my journey/experience.
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Javascript Developer

Interviewed at Optrak

Aug 11, 2023

I applied though LinkedIn. Interview process: 1. Coding round - Front end challenge on React context, check if binary tree 2. How would you solve failed test cases in your code done in 1st round? What can you use instead of Context API? 3. Presentation on a computing project you have undertaken or are undertaking - I did 15 min presentation after which they asked me about my project. Later they presented about their current app version and future version. Few behavioral questions and asked about my journey/experience.

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