I think the key before rating to yourself must be set the meaning of 0 and 10. Once this has been set, the interviewer and you play the same game and your rating will make sense for both. In other case, your evaluation will have a different meaning for the interviewer and you. As @austin
S. Hemmelgarn said inbhis comment, being good at JavaScript could mean a front end skill, a back end skill or both. What's the interviewer figuring out?
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I think the key before rating to yourself must be set the meaning of 0 and 10. Once this has been set, the interviewer and you play the same game and your rating will make sense for both. In other case, your evaluation will have a different meaning for the interviewer and you. As @austin S. Hemmelgarn said inbhis comment, being good at JavaScript could mean a front end skill, a back end skill or both. What's the interviewer figuring out?