Macromedia Flash Professional 8 UNLEASHED [Electronic resources] نسخه متنی

Null Data Type

The null data type is a representation that a variable has no data or definable data (string, number, boolean, and so on). Null will not show up in the Output panel unless assigned in the code.

TIP

Null must be assigned manually; the interpreter will not assign it.

Because null is a representation of no data, it is only equal to itself and the undefined data type. Here's an example:

if (null == undefined) {
trace ("no data equals no data");
}
// output: no data equals no data