&= Operator
Description
Used to perform a bitwise AND on an expression.
Syntax
result &= expressionThe &= operator syntax has these parts:
Part Description result Any variable. expression Any expression.
Remarks
Use of this operator is exactly the same as the following:
result = result & expressionThe &= operator looks at the binary representation of the values of the two expressions and does a bitwise and operation on them. The result of this operation behaves like this:
0101 (expression1) 1100 (expression2) ---- 0100 (result)Any time both of the expressions have a 1 in a digit, the result will have a 1 in that digit. Otherwise, the result will have a 0 in that digit.
As for all bitwise operators, JScript will generate runtime errors for every case in the table below where an E is indicated:
obj as ns num bool undef null obj N E N N N E E as E E E E E E E ns N E N N N E E num N E N N N E E bool N E N N N E E undef E E E E E E E null E E E E E E E obj = Object, as = Alphanumeric String, ns = Numeric String, num = Number, bool = Boolean, undef = Undefined, null = Null value.