⚖️identifier vs. keyword
JS ⟩ identifier ⟩ vs. keyword
there are 5 categories of identifier names:
not keywords (always allowed as identifiers)：
Math,window,toString,_...keywords：
never allowed as identifiers： reserved word (except
await,yield)contextually allowed as identifiers： namely
await,yield.contextually disallowed as identifiers, in strict mode code:：
let,static,implements,interface,package,private,protected,public.always allowed as identifiers, but also appear as keywords within certain syntactic productions, at places where identifier is not allowed:
as,async,from,get,meta,of,set,target.
The term conditional keyword, or contextual keyword, is sometimes used to refer to the keywords that fall in the last 3 categories, and thus can be used as identifiers in some contexts and as keywords in others. 📘ECMA
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