JavaScript tutorial:
& Operator 

 

The (&) operator is use to perform a bitwise AND on two expressions.

Syntax

result = expression1 & expression2

The & operator syntax has these parts:

Part

Description

result

Any variable.

expression1

Any expression.

expression2

Any expression.

Example

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.

See also: &= Operator, Operator Behavior, Operator Precedence, Operator Summary

 

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