Specify what happens when a certain property is read on a map.
work like a can.compute and automatically update themselves when a dependent
observable value is changed.
get( [lastSetValue] )
Defines the behavior when a value is read on a can.Map. Used to provide properties that derive their value from other properties of the map, or update their value from the changes in the value that was set.
The value of the property.
get( lastSetValue, setAttrValue(value) )
Asynchronously defines the behavior when a value is read on a can.Map. Used to provide property values that are available asynchronously.
The value last set by
Updates the value of the property. This can be called multiple times if needed.