objectIsDefined

objectIsDefined ( object : object {, property : string } ) : boolean

Parameter	Type		Description
object	object	→	Object to work with
property	string	→	If passed = property to check, if omitted = check object
Result	boolean	←	If property omitted: true if object is defined, otherwise false. If property passed: true if property is defined, otherwise false.

Description

The objectIsDefined command returns true if object or property is defined, and false otherwise.

By default, if you omit the property parameter, the command checks whether the object is defined. An object is defined if its contents has been initialized.

note

An object can be defined but empty. To find out if an object is undefined or empty, use the objectIsEmpty command.

If you pass the property parameter, the command checks whether this property exists in object. Note that the property parameter is case sensitive. If the property is not found at the first level of object, the command does nothing.

Example 1

 var obj : object
 var def : boolean
 def = objectIsDefined(obj) //false, obj is not initialized

 obj = newObject("Name","Martin")
 objectRemove(obj, "Name")
 def = objectIsDefined(obj) //true, obj is empty but initialized

Example 2

 var obj : object

 obj = newObject("Name","Smith", "Age", 42)  
 ...
 if(objectIsDefined(obj,"Age")
 	...
 end

This test is equivalent to:

 if(valueType(obj,"Age") != Is undefined)

See also

objectIsEmpty