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Performs logical negation on an expression.
Syntax
result = !expression
Arguments
result
Any variable.expression
Any expression.
Remarks
The following table illustrates how result is determined.
If expression is |
Then result is |
|---|---|
True |
False |
False |
True |
All unary operators, such as the ! operator, evaluate expressions as follows:
If applied to undefined or null expressions, a run-time error is raised.
Objects are converted to strings.
Strings are converted to numbers if possible. If not, a run-time error is raised.
Boolean values are treated as numbers (0 if false, 1 if true).
The operator is applied to the resulting number.
For the ! operator, if expression is nonzero, result is zero. If expression is zero, result is 1.
Requirements
See Also
Bitwise NOT Operator (~) (Windows Scripting - JScript)
Operator Precedence (Windows Scripting - JScript)
Operator Summary (Windows Scripting - JScript)