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. The result of this operation behaves as follows:

	Copy Code
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.

Version 1

Reference

Concepts