Reserved Words

The following are Reserved Words in Javascript. This list of reserved words includes several keywords (*) that are reserved for future use as well as some (2) that are only used in Javascript 2.0 (proposed next Javascript version).

abstract (*) as (2) boolean break byte case catch char class (2) continue const (2) debugger (*) default delete do double else enum (*) export (2) extends (2) false

final finally float for function goto (*) if implements (*) import (2) in instanceof int interface (2) is (2) long namespace (2) native (*) new null package (2) private (2)

protected (*) public (2) return short static (2) super (2) switch synchronized (*) this throw throws (*) transient (*) true try typeof use (2) var void volatile (*) while with

There are also a number of Predefined Classes and Objects and Global Properties and Methods in Javascript. While they are not reserved words, the use of those words as variables and functions should be avoided.

The above lists include words that are reserved or have special meanings with one or more letters in the word capitalized. All variations of a word should be avoided to avoid confusion as some browsers ignore capitalization.

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