Sharing variable globally - angularjs

Question

In my main controller I have a user service that returns the current user.
// Curr user
userService.getCurrentUser().then(user => {
mainCtrl.currUser = user;
});
Is there any way to be able to use the currUser variable in other controllers without injecting my service and calling this method over and over again in maybe 50 controllers?
Ex.
// My other awesome controller
console.log(currUser.fullName);

Answer 1

You could go for a LocalStorage or $rootScope. , if you are sure about not using Providers/Services
Sample:
myApp.controller('DemoController1', ['$scope', '$rootScope', function DemoController($scope,$rootScope) {
$rootScope.currUser.fullName ="test";
}]);
Then access it as,
myApp.controller('DemoController2', ['$scope', '$rootScope', function DemoController($scope,$rootScope) {
var fullName = $rootScope.currUser.fullName;
}])

Answer 2

you can use $rootScope like bellow:
mainCtrl.$rootScope.currUser = user;
and the other controller, you can recover this as bellow:
console.log(yourContrl.$rootScope.currUser.fullName);

Answer 3

You don't want you use controller injections? Use injector its the same like injections but also different :D ... like in this runnable fiddle demo. In that way you still can use services, factories, or components.
var myApp = angular.module('myApp',[]);
myApp.controller('MyCtrl', function ($scope) {
$scope.name = angular.injector(['data']).get('user').currUser.username;
});
angular.module('data', []).factory('user', function () {
return {
currUser: {
username: 'Alfred'
}
}
});