Learning JavaScript (2016)

Appendix A. Reserved Words

The following words can’t be used as an identifier (the name of a variable, constant, property, or function) in JavaScript:

§ await (reserved for future use)

§ break

§ case

§ class

§ catch

§ const

§ continue

§ debugger

§ default

§ delete

§ do

§ else

§ enum (reserved for future use)

§ export

§ extends

§ false (literal value)

§ finally

§ for

§ function

§ if

§ implements (reserved for future use)

§ import

§ in

§ instanceof

§ interface (reserved for future use)

§ let

§ new

§ null (literal value)

§ package (reserved for future use)

§ private (reserved for future use)

§ protectd (reserved for future use)

§ public (reserved for future use)

§ return

§ super

§ static (reserved for future use)

§ switch

§ this

§ throw

§ true (literal value)

§ try

§ typeof

§ var

§ void

§ while

§ with

§ yield

The following words were reserved in ECMAScript specifications 1–3. They are no longer reserved words, but I discourage their use, as JavaScript implementations may (incorrectly) consider them reserved words:

§ abstract

§ boolean

§ byte

§ char

§ double

§ final

§ float

§ goto

§ int

§ long

§ native

§ short

§ synchronized

§ transient

§ volatile