Code Style in HelloAngularJS I

This is a rather trivial question as the use of quotation marks in javascript is not dependent on whether they are double or single,

But my question is regarding the choice of using double quotes to register the angular module “myApp” but when creating the controller ‘MainController’ single quotes were used. I believe the angular docs has a tendency to lean towards single quotes in their code examples but I’ve always taught consistency is the only thing that really matters when using quotation marks in JS?