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Showing content from https://webplatform.github.io/docs/javascript/operators/bitwise_not below:

bitwise not · WebPlatform Docs

Performs a bitwise NOT (negation) on an expression.

result = ~ expression

result

Any variable.

expression

Any expression.

See Remarks for explanation

var temp = ~5;

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.

• Logical NOT Operator (!)

• Microsoft Developer Network: Article

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