AngularJS and its use of Dollar Variables

Question

Does anyone know if the reasoning behind the use of dollar methods and variables in angularJS is to instruct angularJS to avoid checking those values when a digestion is going on? So, if angular comes across $scope.$value and $scope.value, then it will avoid checking the former since it's prefixed with a dollar character in its variable name?

Answer 1

It is just a naming convention from the below snippet http://docs.angularjs.org/tutorial/step_05

'$' Prefix Naming Convention
You can create your own services, and in fact we will do exactly that in step 11. As a naming convention, angular's built-in services, Scope methods and a few other angular APIs have a '$' prefix in front of the name. Don't use a '$' prefix when naming your services and models, in order to avoid any possible naming collisions.

http://docs.angularjs.org/guide/concepts#angular_namespace

Angular Namespace
To prevent accidental name collision, Angular prefixes names of objects which could potentially collide with $. Please do not use the $ prefix in your code as it may accidentally collide with Angular code.