In AngularJS you can store data in the $rootScope or create a value-Service? Both of them you can only access with the dependency injection - so where's the difference? When should I use the $rootScope and when the value-Service?
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$rootScope is the root scope object, it is the parent object that all other scope inherit from. When a property is added to $rootScope, that property is available to all descendent $scope objects. These properties are present, even if $rootScope is not injected into the controller, but injection is necessary in order to programmatically modify the properties. Also, due to JavaScript prototype inheritance rules, it is potentially possible for a specific controller to hide a $rootScope value. This makes $rootScope a pseudo global, and potentially unsafe. However, due to the fact that every scope is a descendent of $rootScope, $rootScope is ideal for things like $broadcast.
A Value service is a simple injectable singleton value. It is never available unless injected. A Value is not intended to be modified directly, however it is possible to do so in Angular 1.x. Value can also be intercepted by a Decorator.
