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What are Reserved Keywords

JavaScript Reserve Keywords are the words that you cannot use as identifiers (variable names, function names, and loop labels) in your JavaScript programs.

Reserved Keywords in ECMAScript 5/6 (ES5/6)

abstract	arguments	await*	boolean	break	byte	case	catch
char	class*	const	continue	debugger	default	delete	do
double	else	enum*	eval	export*	extends*	false	final
finally	float	for	function	goto	if	implements	import*
in	instanceof	int	interface	let*	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	yield

Words marked with* are new in ECMAScript 5 and 6.

Removed Reserved Keywords

The following reserved words has been removed from the ECMAScript 5/6 standard:

abstract	boolean	byte	char	double	final	float	goto
int	long	native	short	synchronized	throws	transient	volatile

JavaScript Objects, Properties, and Methods

You should also avoid using the name of JavaScript built-in objects, properties, and methods:

Aray	Date	eval	function	hasOwnProperty
Infinity	isFinite	isNaN	isPrototypeOf	length
Math	NaN	name	Number	Object
prototype	String	toString	undefined	valueOf

HTML Event Handlers

You should also avoid using the name of JavaScript built-in objects, properties, and methods:

onblur	onclick	onerror	onfocus	onkeydown	onkeypress
onkeyup	onmouseover	onload	onmouseup	onmousedown	obsubmit

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