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Microsoft® JScript
! Operator

See Also

Language Reference |

Description
Used to perform logical negation on an expression.

Syntax
result = !expression

The ! operator syntax has these parts:

Part Description
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.
  • Booleans 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.

© 1996 by Microsoft Corporation.
file: /Techref/language/asp/js/174.htm, 3KB, , updated: 1996/11/22 11:11, local time: 2024/3/28 11:56,
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