Creates variables used with conditional compilation statements.
@set @varname = term
Required. Valid JScript variable name. Must be preceded by an "@" character at all times.
Required. Zero or more unary operators followed by a constant, conditional compilation variable, or parenthesized expression.
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.