Microsoft JScript
&= Operator
Language Reference
Version 1

See Also

Used to perform a bitwise AND on an expression.
result &= expression

The &= operator syntax has these parts:

Part Description
result Any variable.
expression Any expression.
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.