Reserved (key)words

Reserved words in programming are words that cannot be used as identifiers because they mean something or perform a certain function in that particular programming language.

Here is a list of the reserved words in JavaScript:

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abstract	arguments	await	boolean
break	byte	case	catch
debugger	default	delete	do
enum	eval	export	extends
finally	float	for	function
implements	import	in	instanceof
let	long	native	new
private	protected	public	return
super	switch	synchronized	this
transient	true	try	typeof
volatile	while	with	yield

These are the reserved words in JavaScript. The ones marked with a warning sign are words that have been removed from the ECMAScript 5 and 6 standard. Even though they have been removed, you should not use them as variable names because ECMAScript 5 and 6 and not yet fully supported on all browsers.