> Semicolons in Javascript are optional

Yes, if there is a newline that can syntactically stand in for semicolon, or a closing brace etc.
Some people think this is cool, I think it's kinda ridiculous / sloppy.
I can tell you it plays hell with the lexical scanner, I don't think you can use traditional tools like lex, and even if this weren't there, the bare regular expressions   /jkl'"qrs/  also derail any traditional scanner.
Yuck! Well that's duktape's problem.

Karl Dahlke