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You're just describing leetcode here. Not something most people even do in their day-to-day.

A lot of frontend devs don't even work with the DOM directly after having spent years with React. Could they do it? probably. Are they prepared for DOM-related manipulation questions on a whiteboard? nope.

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What exactly is leetcode? as opposed to just asking someone to prove they know the stuff listed on their resume.

And suppose there are a lot of cheaters out there who don't know the things on their resume, even including earning a degree without ever having to write a working program on their own. How would you screen them out?

Leetcode is 5-minute-interview-coding-questions-as-a-service: https://leetcode.com/

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