Which are javascript reserved words?

You should avoid using these reserved words and keywords as function or variable names as JavaScript has reserved these words for its own use.

Table of Contents Show

What are Reserved Keywords?
Reserved Keywords in ECMAScript 5 (ES5)
Reserved Keywords in ECMAScript 6 (ES6)
Future Reserved Keywords in Older Standards
How many reserved words are in JavaScript?
Is array a reserved word in JavaScript?
What are keywords reserved words?
Which of the following are JavaScript reserved words Mcq?

JavaScript Reserved Words
break	export	return
case	for	switch
comment	function	this
continue	if	typeof
default	import	var
delete	in	void
do	label	while
else	new	with

Java Keywords (Reserved by JavaScript)
abstract	implements	protected
boolean	instanceOf	public
byte	int	short
char	interface	static
double	long	synchronized
false	native	throws
final	null	transient
float	package	true
goto	private

ECMAScipt Reserved Words
catch	enum	throw
class	extends	try
const	finally
debugger	super

Other JavaScript Keywords
alert	isFinite	personalbar
Anchor	isNan	Plugin
Area	java	print
arguments	JavaArray	prompt
Array	JavaClass	prototype
assign	JavaObject	Radio
blur	JavaPackage	ref
Boolean	length	RegExp
Button	Link	releaseEvents
callee	location	Reset
caller	Location	resizeBy
captureEvents	locationbar	resizeTo
Checkbox	Math	routeEvent
clearInterval	menubar	scroll
clearTimeout	MimeType	scrollbars
close	moveBy	scrollBy
closed	moveTo	scrollTo
confirm	name	Select
constructor	NaN	self
Date	navigate	setInterval
defaultStatus	navigator	setTimeout
document	Navigator	status
Document	netscape	statusbar
Element	Number	stop
escape	Object	String
eval	onBlur	Submit
FileUpload	onError	sun
find	onFocus	taint
focus	onLoad	Text
Form	onUnload	Textarea
Frame	open	toolbar
Frames	opener	top
Function	Option	toString
getClass	outerHeight	unescape
Hidden	OuterWidth	untaint
history	Packages	unwatch
History	pageXoffset	valueOf
home	pageYoffset	watch
Image	parent	window
Infinity	parseFloat	Window
InnerHeight	parseInt
InnerWidth	Password

This section contains a list of all keywords that are reserved in JavaScript.

What are Reserved Keywords?

JavaScript has a number of reserved keywords. These 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 (ES5)

The following list shows the keywords that are reserved in ECMAScript 5. It also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.

arguments sm break case catch class fr const fr continue debugger default delete do else enum fr eval sm export fr extends fr false finally for function if implements sm import fr in instanceof interface sm let sm new null package sm private sm protected sm public sm return static sm super fr switch this throw true try typeof var void while with yield sm

Note: The keywords arguments and eval are not strictly reserved keywords, but they are treated like keywords in strict mode, so they cannot be used as identifiers. Additionally, the keywords null, true, and false cannot be used as identifiers in ECMAScript.

Reserved Keywords in ECMAScript 6 (ES6)

The following list shows the keywords that are reserved in ECMAScript 6. It also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.

arguments sm await break case catch class const continue debugger default delete do else enum fr eval sm export extends false finally for function if implements sm import in instanceof interface sm let sm new null package sm private sm protected sm public sm return static sm super switch this throw true try typeof var void while with yield

Future Reserved Keywords in Older Standards

The following list shows the keywords that were reserved as future keywords by the older ECMAScript specifications (before ECMAScript 5 or ES5).

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

Note: For optimal backwards compatibility, you should better avoid using all the keywords shown on this page as variable names or property names in your JavaScript code.

How many reserved words are in JavaScript?

The spec describes four groups of reserved words: keywords, future reserved words, null literals and boolean literals.

Is array a reserved word in JavaScript?

Some SPECIAL words such as Object , Array , Function , Method , Number etc are not belong to keywords in Javascrpt: Reserved Keywords in Javascript.

What are keywords reserved words?

keyword, - a word with special meaning in a particular context. It's semantic definition. reserved word is a word that cannot be used as an identifier - such as, variable, and function name.