Why why can you not jse any of the java script reserved words

Question

I read that it says not to use the reserve words why?

Answer 1

Because they are reserved for the language. For example: for, while, do, if, else, function...

Answer 2

actually, in any programming language you shouldn't use reserved words. Depending on language, you'll get a compilation / interpretation error or unexpected results from running a code.

there's the one exception from that rule: if only you clearly know and understand what you are doing.