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Microsoft® JScript
~ Operator

See Also

Language Reference |

Description
Used to perform bitwise negation on an expression.

Syntax
result = ~expression

The ~ operator syntax has these parts:

Part Description
result Any variable.
expression Any expression.
Remarks
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.

The ~ operator looks at the binary representation of the values of the expression and does a bitwise negation operation on it. The result of this operation behaves as follows:


0101    (expression)
----
1010    (result)

Any digit that is a 1 in the expression becomes a 0 in the result. Any digit that is a 0 in the expression becomes a 1 in the result.


© 1996 by Microsoft Corporation.

See also:


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