Makes changes observable for this collection.

Adding any kind of change listener to an object will call this method. Various collections implement this method to activate internal change listeners needed to propagate their own changes. Particularly, the module collections/listen/array-changes installs this method on the Array prototype.

Calling this method on an array will either swap its prototype with the observable array prototype or patch observable methods on the instance. These methods in turn translate all array changes into range changes (as all changes can be modeled by a splice operation), map changes (as the array is a map from index to value), and property changes (as every index is a property, but also taking the length into account).

On collections

• List
• Set
• Array