controller_4.js

/* A éviter */
function Sessions(data) {
  var vm = this;

  vm.gotoSession = gotoSession;
  vm.refresh = function() {
    /** 
    * les 
    * multiples 
    * lignes
    * de
    * code
    * diminu
    * la
    * lisibilité
    */
  };
  vm.search = search;
  vm.sessions = [];
  vm.title = 'Sessions';
}

/* Recommandé */
function Sessions(dataservice) {
  var vm = this;

  vm.gotoSession = gotoSession;
  vm.refresh = dataservice.refresh; // 1 liner OK
  vm.search = search;
  vm.sessions = [];
  vm.title = 'Sessions';
}