Supported types of Observable Properties

Observable properties can hold several types of values:

Any type

Change notification will occur only when the value is assigned to the property.

Mutable sequential types

Like lists and maps. A notification will occur even when the content of the object changes, e.g. when one element of the sequence is assigned, added, removed, etc.

User classes

The user can declare the set of methods that can be observed (i.e. observables will be notified when before or/and after observed object methods are called.)

Events

To notify the observers that some event is occurred.

All needed details about observable property types are explained later in this document (see section 5.5.1).