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@set Statement (JScript 5.6) 

  • Article

Creates variables used with conditional compilation statements.


@set @varname = term

Arguments

  • varname
    Required. Valid JScript variable name. Must be preceded by an "@" character at all times.
  • term
    Required. Zero or more unary operators followed by 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.

Requirements

Version 3

See Also

Reference

@cc_on Statement (JScript 5.6)
@if Statement

Concepts

Conditional Compilation (JScript 5.6)
Conditional Compilation Variables (JScript 5.6)