MACROMEDIA FLASH MX 2004 - ACTIONSCRIPT Reference Manual page 739

typeof
Availability
Flash Player 5.
Usage
typeof(expression)
Parameters
A string, movie clip, button, object, or function.
expression
Description
Operator; a unary operator placed before a single parameter. The
Flash interpreter to evaluate
a string, movie clip, object, function, number, or Boolean value. The following table shows the
results of the
typeof
Parameter
String
Movie clip
Button
Text field
Number
Boolean
Object
Function
; the result is a string specifying whether the expression is
expression
operator on each type of expression.
Output
string
movieclip
object
object
number
boolean
object
function
operator causes the
typeof
typeof 739