Mandatory JavaScript topics to cover before your frontend interview-

13. Polyfill for map, reduce, filter, forEach

16. Infinite depth flatten and flatten by a certain number

17. Implement both recursive and iterative approaches

19. Given an object make the keys as values and values as keys. Handle duplicates, assuming values are only strings

20. Implement observable (not very common, good to have)

23. Polyfill for Promise. all , allsettled and other methods

27. Implement setInterval using setTimeout

These are interview essentials. Master these topics for a solid performance in web development interviews.

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JavaScript Interview Questions

Senior Frontend Engineer

Software Developer

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JavaScript is essential for developing interactive websites and web applications. It is a versatile and powerful language that is used in both front-end and back-end development, making it a great skill to learn and master.

JavaScript



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LLD is a crucial skill to learn as it helps develop problem-solving skills, teaches the basics of software engineering, and provides a platform to apply theoretical knowledge in a practical context.



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Typescript is a strongly typed language that enables more efficient code development, debugging and maintenance. It also helps to catch errors before the code is run, leading to faster development cycles.