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Frontend · Junior · Theory

What is the virtual DOM, and why do frameworks need it?

~4 min by voice

How to approach it

This checks whether the candidate understands the mechanics of the virtual DOM (JS objects, diffing, applying the differences) and its real value, which is being declarative, rather than repeating the myth that "the VDOM is just faster."

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Answer by voice

The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.

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Best with headphones · ~4 min