List of keywords and reserved words in JavaScript

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Keyword or Reserved words

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

In JavaScript, we do not need to specify the type of the variable because it is dynamically used by the JavaScript engine.
We can use var data type. It can hold any type of data like String, Number, Boolean, etc.

Primitive Data Type Non-Primitive Data type

String Object
Number Array
Boolean RegExp
Undefine