Beginning JavaScript, 5th Edition

BJavaScript Core Reference

This appendix outlines the syntax of all the JavaScript core language functions and objects with their properties and methods. If changes have occurred between versions, they have been noted.

BROWSER REFERENCE

The following table outlines which JavaScript version is in use and in which browser it is used. Note that earlier versions of Internet Explorer implemented Jscript, Microsoft’s version of JavaScript. However, Jscript’s features are relatively the same as JavaScript.

JAVASCRIPT VERSION	MOZILLA FIREFOX	INTERNET EXPLORER	CHROME	SAFARI	OPERA
1.0	3.0
1.1
1.2
1.3	4.0
1.4
1.5	1.0	5.5, 6, 7, 8	1–10	3-5	6, 7, 8, 9
1.6	1.5
1.7	2.0	28
1.8	3.0	11.5
1.8.1	3.5
1.8.2	3.6
1.8.5	4	9	32	6	11.6

RESERVED WORDS

Various words and symbols are reserved by JavaScript. These words cannot be used as variable names, nor can the symbols be used within them. They are listed in the following table.

abstract	boolean	break
byte	case	catch
char	class	const
continue	debugger	default
delete	do	double
else	enum	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
-	!	~
%	/	*
>	<	=
&	^	|
+	?

Other Identifiers to Avoid ...