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Logical NOT Operator (!) (JScript 5.6) 

  • Article

Performs logical negation on an expression.


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

Version 1

See Also

Reference

Bitwise NOT Operator (~) (JScript 5.6)

Concepts

Operator Precedence (JScript 5.6)
Operator Summary (JScript 5.6)