The Three Watch Depths of AngularJS

There are three different mechanisms for watching a value on an Angular scope: Reference watches, collection watches, and equality watches. The difference between the three is in the depth in which they watch their values.

Choosing the most appropriate watch mechanism is important, not only because the three mechanisms behave differently, but also because they have very different performance characteristics.

This short article describes the differences between the three watch depths.

Reference W...