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JScript Logical NOT Operator (!)

Used to perform logical negation on an expression.

Syntax: JScript Logical NOT Operator (!)

result = !expression

Arguments: JScript Logical NOT Operator (!)

result

Any variable.

expression

Any expression.

Remarks: JScript Logical NOT Operator (!)

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.

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