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Javascript Reserved Words

The following are reserved keywords words in Javascript and may not be otherwise used. This list includes the new keywords that are reserved for future use.

  • abstract
  • boolean
  • break
  • byte
  • case
  • catch
  • char
  • class
  • continue
  • const
  • debugger
  • default
  • delete
  • do
  • double
  • else
  • extends
  • enum
  • export
  • false
  • final
  • finally
  • float
  • for
  • function
  • goto
  • if
  • implements
  • import
  • in
  • instanceOf
  • int
  • interface
  • label
  • 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

 

The following words are not reserved but have special meanings and therefore their use as variables or function names should also be avoided.

  • alert
  • anchor
  • area
  • arguments
  • array
  • assign
  • blur
  • button
  • callee
  • caller
  • captureevents
  • checkbox
  • clearinterval
  • cleartimeout
  • close
  • closed
  • confirm
  • constructor
  • date
  • defaultstatus
  • document
  • element
  • escape
  • eval
  • fileupload
  • find
  • focus
  • form
  • frame
  • frames
  • function
  • getclass
  • hidden
  • history
  • home
  • image
  • infinity
  • innerheight
  • isfinite
  • innerwidth
  • isnan
  • java
  • javaarray
  • javaclass
  • javaobject
  • javapackage
  • length
  • link
  • location
  • locationbar
  • math
  • menubar
  • mimetype
  • moveby
  • moveto
  • name
  • nan
  • navigate
  • navigator
  • netscape
  • number
  • object
  • onblur
  • onerror
  • onfocus
  • onload
  • onunload
  • open
  • opener
  • option
  • outerheight
  • outerwidth
  • packages
  • pagexoffset
  • pageyoffset
  • parent
  • parsefloat
  • parseint
  • password
  • personalbar
  • plugin
  • print
  • prompt
  • prototype
  • radio
  • ref
  • regexp
  • releaseevents
  • reset
  • resizeby
  • resizeto
  • routeevent
  • scroll
  • scrollbars
  • scrollby
  • scrollto
  • select
  • self
  • settimeout
  • status
  • statusbar
  • stop
  • string
  • submit
  • sun
  • taint
  • text
  • textarea
  • toolbar
  • top
  • tostring
  • undefined
  • unescape
  • untaint
  • unwatch
  • valueof
  • watch
  • window

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