Writing Angular with Migration in Mind: Ex. 1

ServiceExample2.js

angular.module('myModule')
  .service('addresses', ['addressService', '$q', Addresses]);

class Addresses {
  constructor(addressService, $q) {
    this.$q = $q;
    this.addressService = addressService;
    this.prefix = "My Address: "
  }
  printAddress() {
    return this.$q((resolve, reject) => {
      addressService.getFullAddress((addr) => {
        resolve(this.prefix + addr);
      }, reject);
    });
  }
}