List in Ship

commands/random-res/ship.js

@@ -21,6 +21,7 @@ module.exports = class ShipCommand extends Command {
     run(msg, args) {
         const { things } = args;
         const rating = Math.floor(Math.random() * 100) + 1;
-        return msg.say(`I'd give ${things.join(' and ')} a ${rating}%!`);
+        const list = `${things.slice(0, -1).join(', ')}${things.length > 1 ? ' and ' : ''}${things.slice(-1)}`;
+        return msg.say(`I'd give ${list} a ${rating}%!`);
     }
 };