[babarock]

I don't know if you're a good or bad programmer, but I'll tell you this about job interviews:

I've given dozens of interviews over the past 3 years. I'm fairly certain everyone got out of the interview with me feeling like they did very poorly, when in fact a lot of people were doing well. All of the people I ended up hiring told me "I was sure I completely failed your interview".

You don't know what interviewers are looking for, so don't make assumptions. I'm almost never looking for a "correct" answer. I'm always looking for your behavior and attitude when answering those questions. My definition of a good programmer is someone who understands that it's a team sports, who values clear communication and who knows how to read the doc on their own. You may or may not have implemented your own lisp in your spare time, but this is secondary.

If you ask me to review the quality of your code, I'll spend more time reading your commit messages and variable names, than you realize. It's as important as the choice of algorithm and data structure.

Other interviewers value other things. There's no one thing.

TLDR: You don't know how well you did in interviews, it's very likely you're better than you think.