Microsoft JScript
@set Statement |
Language Reference
Version 3 |
Allows creation of variables used in conditional compilation statements.
@set @varname = termThe @set statement syntax has these parts:
Part Description varname 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.
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.