• function

Provides a constructor function to be used to provide a default value for a certain property of a can.Map. This constructor will be invoked with new each time a new instance of the map is created.


A constructor function can be provided that is called to create a default value used for this property, like:

define: {
  prop: {
    Value: Array
  person: {
    Value: Person

Similar to value, this uppercase version provides a mechanism for providing a default value. If the default value is an object, providing a constructor is a good way to ensure a copy is made for each instance.