Create an AngularJS service that will hold the data and inject it inside of the controllers.

Using a service is the cleanest, fastest and easiest way to test.

However, there are couple of other ways to implement data sharing between controllers, like:

☛ Using events

☛ Using $parent, nextSibling, controllerAs, etc. to directly access the controllers

☛ Using the $rootScope to add the data on (not a good practice)

☛ The methods above are all correct, but are not the most efficient and easy to test.