Challenge

Here's your first task: can you think of how to improve the code so that in the re-randomization, it elegantly checks to see whether the new randomization also exists in our database? Hint: you may want to create a separate helper function or two.

Maybe you arrived at something like this (https://github.com/PacktPublishing/Hands-on-JavaScript-for-Python-Developers/tree/master/chapter-13/starship-app-solution1):

const eliminateExistingShips = async () => {
 const shipNames = require('../data/starship-names');
 const ships = await storage.values();
 
 const names = Object.values(ships).map((value, index, arr) => {
   return value.name;
 });
 
 const availableNames = shipNames.names.filter((val) => {
   return !names.includes(val);
 });
 
 const unavailableRegistryNumbers = Object.values(ships).map((value, index, 
 arr) => {
   return value.registry;
 });
 
 return { names: availableNames, unavailableRegistries: 
 unavailableRegistryNumbers };
}

And to use it, execute...