Microsoft® JScript®
& Operator
 Language Reference 
Version 1 

See Also

Performs a bitwise AND on two expressions.
result = expression1 & expression2

The & operator syntax has these parts:

Part Description
result Any variable.
expression1 Any expression.
expression2 Any expression.

The & operator looks at the binary representation of the values of two expressions and does a bitwise AND operation on them. The result of this operation behaves as follows:
0101    (expression1)
1100    (expression2)
0100    (result)
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.