I think the whiteboard coding interview can be quite successful /if it is done well/. Which it unfortunately often isn't.
It ought to feel like a collaboration. Your interviewer's goal should be to get a taste for what it would feel like if they were stuck on a problem and asked you to grab a whiteboard with them and map it out together.
In that configuration, it's not about the candidate having all the answers right away. It's about their ability to communicate and take little ideas that you feed them and build on them.
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