Suprisingly for me the controller state in AngularJS is not preserved between the controller invocations. I at least expected an option to switch it on and off on demand. For the classic application it was difficult to achieve that we may restore the state for a given view (eg. to be on the same page as we were leaving the view), what sounds great for me from the application usability point of view.
But, it's right there, so it can be implemented. However, I don't like using the $rootScope for this, what can be found in many examples on the net, in the same way I don't use globals, because they produce a mess. Here I'd like to propose an elegant solution for this.
I have the service that holds all controller states, and provide the initialization function that may be used when the state hasn't been cached yet. The code snippet: