JavaScript® Bible, Sixth Edition

Appendix B. JavaScript Reserved Words

Every programming language has a built-in vocabulary of keywords that you cannot use for the names of variables and the like. Because a JavaScript function is an object that uses the function name as an identifier for the object, you cannot employ reserved words for function names either. It's worth nothing that many of the keywords in the list are not technically a part of the JavaScript language just yet, but they are reserved for potential future use. Remember that JavaScript keywords are case-sensitive. Although you may get away with using these words in other cases, it may lead to unnecessary confusion for someone reading your scripts.

abstract	boolean	break	byte
case	catch	char	class
const	continue	debugger	default
delete	do	double	else
enum	export	extends	false
final	finally	float	for
function	goto	if	implements
import	in	instanceof	int
interface	long	native	new
null	package	private	protected
public	return	short	static
super	switch	synchronized	this
throw	throws	transient	true
try	typeof	var	void
volatile	while	with