Watch (Object.watch Method) - MACROMEDIA FLASH 8-FLASH LITE 2.X ACTIONSCRIPT LANGUAGE Reference

Example
The following example shows the return value of valueOf() for a generic object (which does
not have a primitive value) and compares it to the return value of toString(). First, create a
generic object. Second, create a new Date object set to February 1, 2004, 8:15 AM. The
toString() method returns the current time in human-readable form. The valueOf() method
returns the primitive value in milliseconds. Third, create a new Array object containing two
simple elements. Both toString() and valueOf() return the same value: one,two:
// Create a generic object
var myObject:Object = new Object();
trace(myObject.valueOf()); // output: [object Object]
trace(myObject.toString()); // output: [object Object]
The following examples show the return values for the built-in classes Date and Array, and
compares them to the return values of :
Object.toString()
// Create a new Date object set to February 1, 2004, 8:15 AM
// The toString() method returns the current time in human-readable form
// The valueOf() method returns the primitive value in milliseconds
var myDate:Date = new Date(2004,01,01,8,15);
trace(myDate.toString()); // output: Sun Feb 1 08:15:00 GMT-0800 2004
trace(myDate.valueOf()); // output: 1075652100000
// Create a new Array object containing two simple elements
// In this case both toString() and valueOf() return the same value: one,two
var myArray:Array = new Array("one", "two");
trace(myArray.toString()); // output: one,two
trace(myArray.valueOf()); // output: one,two
See the example for for an example of the return value of
Object.toString()
for a custom class that overrides .
Object.valueOf() toString()
See also
toString (Object.toString method)

watch (Object.watch method)

public watch(name:String, callback:Function, [userData:Object]) : Boolean
Registers an event handler to be invoked when a specified property of an ActionScript object
changes. When the property changes, the event handler is invoked with as the
myObject
containing object.
566 ActionScript classes