Ability to enhance how watch checks for equality for my own classes

[lee-elenbaas]

If i have a complex class MyClass that has many properties, i can usually provide better implementation for testing equality for that class then the default angular.equals.

Ffor my own watch i can optimize them by making sure i only perform watch on the specific state properties. but if my code uses some library, i can not customize the way that library perform its watch on my objects

The simplest example is an ng-repeat on an array of such objects

So i am looking for a way that i can enhance the equals mechanism used inside angular to fit better the specific SPA.

One possible option i presented in this pull request #5913

[btford]

Is there a reason you can't use track by?

[caitp]

I don't think we can really do this and make it part of the API... Something which is doable for your own app is to patch AngularJS manually, if you don't have a way to monkey-patch a particular part of it.

There are some articles out there which can help you monkey-patch angular for some particular performance enhancements (http://blog.scalyr.com/2013/10/31/angularjs-1200ms-to-35ms/ is one), and maybe some of these perf enhancements will make it into core some day, who knows.

If there are proper perf concerns with ngRepeat (which there certainly are) which don't involve enabling monkey-patching, then that's something which is much easier to deal with.

[gkalpak]

This has been discussed in several issues. Closing as duplicate of #10069 (which has an associated PR). Let's move the discussion there.