What is the result of this assignment?

Question

JavaScript

I found the following code in the source code of the service:
var self = $rootScope.$service_name = this;
$service_name - the service itself. Can you tell me what this code does? Puts a service instance in $rootScope and assigns it to self? Why is such a trick needed?

Answer 1

Why assign a service object to $rootScope - I don't know. Probably some kind of global helper.
Assignment to self - not to lose context in callbacks.