Where does the "Uncaught SyntaxError: Unexpected end of input" originate?

Question

I've tried many code editors, but they keep returning this error. When I used a code validator, it said there weren't any.
https://code.sololearn.com/W5a162A10a12/#

Answer 1

there were a lots of issues that i fixed

https://code.sololearn.com/W4TbHkvf6Z7k/?ref=app

see comments in js tab for edits that i have made

Answer 2

I think it happens when you forget to close the bracket.For example missing a } or something like that.

Answer 3

code validators only check the html sttucture, not the embeded javascript syntax...

"unexpected end of input" could occurs for unclosed strings, brackets or even parenthesis...

Answer 4

Alright, say where's my problem, then.