No, this is not the only purpose of the interview. The purpose is to check if you know JavaScript and var are super basic. I can not imagine a JavaScript developer that does not know what is var, that being said-it is very legitimate to ask about it and to ask if you would use it in 2022.
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25+ years developing software. Lead web instructor & mentor. Focused in last few years on React. Check more info in www.nathankrasney.com
