| 2. 6. 2. Logical AND |
|
|
The logical AND operator in JavaScript is indicated by the double ampersand (&&): |
|
var bTrue = true;
var bFalse = false;
var bResult = bTrue && bFalse;
|
|
Logical AND behaves as described in the following truth table: |
| Operand 1 | Operand 2 | Result | | true | true | true | | true | false | false | | false | true | false | | false | false | false |
|
Logical AND can be used with any type of operands, not just Boolean values. When either operand is not a primitive Boolean, logical AND does not always return a Boolean value: |
If one operand is an object and one is a Boolean, the object is returned. |
If both operands are objects, the second operand is returned. |
If either operand is null, null is returned. |
If either operand is NaN, NaN is returned. |
If either operand is undefined, an error occurs. |