function createAndUpdateDB() {
  'use strict';

  //check for support
  if (!('indexedDB' in window)) {
    console.log('This browser doesn\'t support IndexedDB');
    return;
  }

  var dbPromise = idb.open('restaurant-reviews', 1, function(upgradeDb){
    if (!upgradeDb.objectStoreNames.contains('restaurants')) {
      upgradeDb.createObjectStore('restaurants', {keyPath:  'id'});
    }
  });

  var items;
  DBHelper.fetchRestaurants( (error, restaurants) => {
    if(error){
      console.log(error);
    } else {
      items = restaurants;
    }
  });

  dbPromise.then(function(db) {
    var tx = db.transaction('restaurants', 'readwrite');
    var store = tx.objectStore('restaurants');
    items.forEach(item => {
      store.put(item);
    });
    return tx.complete;
  }).then(function() {
    console.log('Store Updated');
  });
}