Microsoft® JScript™ &= Operator | Language Reference Version 1

See Also

##### Description

> Used to perform a bitwise AND on an expression.

##### Syntax

> result &= expression

> The &= operator syntax has these parts:

> Part | Description
> result | Any variable.
> expression | Any expression.

##### Remarks

> Using this operator is exactly the same as specifying:

> >     result = result & expression

> The &= operator looks at the binary representation of the values of result and expression and does a bitwise AND operation on them. The output of this operation behaves like this:

> >     0101    (result)
> >     1100    (expression)
> >     ----
> >     0100    (output)

> Any time both of the expressions have a 1 in a digit, the result has a 1 in that digit. Otherwise, the result has a 0 in that digit.

> For information on when a run-time error is generated by the &= operator, see the Operator Behavior table.

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