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Bitwise NOT Operator (~) (JavaScript)

Performs a bitwise NOT (negation) on an expression.

result = ~ expression

result

Any variable.

expression

Any expression.

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.

The ~ operator looks at the binary representation of the values of the expression and does a bitwise negation operation on it.

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.

The following example illustrates use of the bitwise NOT (~) operator.

var temp = ~5;

The resulting value is -6, as shown in the following table.

Expression

Binary value (two's complement)

Decimal value

5

00000000 00000000 00000000 00000101

5

~5

11111111 11111111 11111111 11111010

-6

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.

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