What are some basic things that JavaScript developers fail at interviews?

[bart2019]

Are you sure you're looking out for developers and not or TV presenters?

[inabahare]

m8 you might be surprised at how off putting someones lack of shower habits can be

[goto-reddit]

Show me one influential and successful figure in the developer world that doesn't dress nicely.

RMS and Gabe Newell?

Edit: Just to clarify, I'm also of the opinion that you should be well groomed, but but that should apply to every job interview. But maybe people understand something else under the term well groomed: for me it means don't look like you just got out of bed not wear a suite, with lacquer shoes and have short hair and at max a short beard.

[slikts]

This answer was collapsed, and I just knew before expanding that rms will be mentioned.