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7.4.11 Bitwise NOT Operator (~)

Used to perform a bitwise NOT (negation) on an expression.
 

Syntax

result = ~ expression

Arguments

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.
  • 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. The result of this operation behaves as follows:
 

0101 (expression)

----

1010 (result)

1011

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.
 

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