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//services.js
angular.module('tutorialApp.services', [])
.factory('MyService', ['MyOtherService', function(MyOtherService) {
  return {
    doWork: function() {
      return MyOtherService.doWork();
    }
  }
}])
.factory('MyOtherService', [function() {

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//controller.js
describe('tutorialApp controllers', function() {

	beforeEach(module('tutorialApp.controllers'));

	describe('TutorialCtrl', function(){
		var scope, ctrl;

		beforeEach(inject(function(_$httpBackend_, $rootScope, $controller) {
			scope = $rootScope.$new();

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val myString: String = null //Error: Null can not be a value of a non-null type String

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val myString: String? = null

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val myString: String? = null
println(myString.length) //Error: Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?

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val myString: String? = null
val length = myString?.length
println("Length of myString: $length")

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if (person != null && person.getPersonId() != null && person.getPersonId().getId() != null && person.getPersonId().getId().getIntValue() != null) {
  …
} else {
  return null;
}

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return person.?getPersonId().?getId().?getIntvalue()

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String myString = null;
int length = myString != null ? myString.length() : 0;
System.out.println("Length of myString: " + length);

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var myString: String? = null
val length = myString?.length ?: 0
println("Length of myString: $length")