JScript has a number of reserved words that you cannot use as identifiers. Reserved words have a specific meaning to the JScript language, as they are part of the language syntax. Using a reserved word causes a compilation error when loading your script.

JScript also has a list of future reserved words. These words are not currently part of the JScript language, although they are reserved for future use.

Reserved Words

break

delete

function

return

typeof

case

do

if

switch

var

catch

else

in

this

void

continue

false

instanceof

throw

while

debugger

finally

new

true

with

default

for

null

try

 

Future Reserved Words

abstract

double

goto

native

static

boolean

enum

implements

package

super

byte

export

import

private

synchronized

char

extends

int

protected

throws

class

final

interface

public

transient

const

float

long

short

volatile

When choosing identifiers it is also important to avoid any words that are already the names of intrinsic JScript objects or functions, such as String or parseInt.

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