7.5.13 @set Statement

Allows creation of variables used in conditional compilation statements.
Syntax
@set @varname = term
- varname
- A valid JScript variable name. Must be preceded by an "@" character at all times.
- term
- Zero or more unary operators followed by either a constant, conditional compilation variable, or parenthesized expression.
Remarks
Numeric and Boolean variables are supported for conditional compilation. Strings are not. Variables created using @set are generally used in conditional compilation statements, but can be used anywhere in JScript code.
Examples of variable declarations look like this:
@set @myvar1 = 12
@set @myvar2 = (@myvar1 * 20)
@set @myvar3 = @_jscript_version
The following operators are supported in parenthesized expressions:
! ~
* / %
+ -
<< >> >>>
< <= > >=
== != === !==
& ^ |
&& ||
If a variable is used before it has been defined, its value is NaN. NaN can be checked for using the @if statement:
@if (@newVar != @newVar)
...
This works because NaN is the only value not equal to itself.
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