Bitwise AND then assign (&=) (Operator/assignment)

Bitwise AND two operands and assign the result to the first.


ECMAScript edition - 2
JavaScript - 1.0
JScript - 1.0
Internet Explorer - 3.02
Netscape - 2.0
Netscape Enterprise Server - 2.0
Opera - 3.0
Property/method value type:Number primitive
JavaScript syntax:-anOperand1 &= anOperand2
Argument list:anOperand1A binary value
anOperand2Another binary value

Bitwise AND the right operand with the left operand and assign the result to the left operand.

This is functionally equivalent to the expression:

anOperand1 = anOperand1 & anOperand2;

Although this is classified as an assignment operator it is really a compound of an assignment and a bitwise operator.

The associativity is right to left.

Refer to the Operator Precedence topic for details of execution order.

The new value of anOperand1 is returned as a result of the expression.

The truth table shows the result of this operator for two Boolean primitive values:


This is applied to each corresponding bit pair in the two values.


See also:Assignment operator, Associativity, Bit-field, Bitwise AND (&), Bitwise expression, Bitwise operator, Logical AND (&&), LValue, Operator Precedence

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ECMA 262 edition 2 - section - 11.13

ECMA 262 edition 3 - section - 11.13