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Rules of declaring variable names

Variable names can be freely named within some rules. Today, let's look at the rules for declaring variable names.

1. Variable names include only alphanumeric characters and underbar (_).

2. Variable names distinguish between upper and lower case letters.

3. Variable names distinguish between upper and lower case letters.

4. Reserved words can not be used. (Eg, if, for, while etc.)

Types of reserved words

abstract

case

continue

extends

for

import

long

private

static

throw

var

boolean

catch

default

false

function

in

native

protected

super

throw

void

break

char

do

final

goto

instanceof

new

public

switch

transient

while

byte

class

double

finally

if

int

null

return

synchronized

true

with

case

const

else

float

implements

interface

package

short

this

try


For example, the following variables are not allowed:

1hi = "hello";    wrong since it begins with a number.
if = "hello";   wrong since it uses a reserved words.
sos+dfdf = "hello";  wrong since is has + 

Let's wrap up this lesson here ^^

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