JavaScript® Programmer's Reference

Appendix E. Reserved and Special Words

Like most languages, JavaScript has a number of keywords that either cannot or should not be used as identifiers for functions and variables. They're either reserved for future use in the language, are currently part of some version of the language, or are used in critical components or extensions that users have (perhaps as part of their browsers).

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