Variables in SJS

Concepts

• Variables in SJS are references to values.
• Undeclared variables, when directly assigned, are defined as global variables.
• Variables that are declared but not assigned have a default value of undefined.
• var behaves like in JavaScript and has variable hoisting.
• const and let are supported, behaving like JavaScript.

// In an SJS module
var count = 110;
var bar = "hello";
// undef === undefined
var undef;
const NAME = "SJS";
let str = "string";

Variable Names

Variable names must adhere to the following two rules:

• The first character must be a letter (a-zA-Z) or an underscore (_).
• The remaining characters can be letters (a-zA-Z), underscores (_), or numbers (0-9).

Reserved Identifiers

The following identifiers cannot be used as variable names:

for
do
while
default
continue
switch
case
break

var
null
undefined
Infinity
NaN

void
delete
typeof

if
else

true
false

require
function
arguments
this
return