1class NotificationHandler {
2    constructor(userLanguage) {
3        this.language = userLanguage;
4        this.templates = {
5            en: {
6                welcome: (name) => `Welcome back, ${name}!`,
7                newMessage: (count) => `You have ${count} new messages`
8            },
9            es: {
10                welcome: (name) => `¡Bienvenido nuevamente, ${name}!`,
11                newMessage: (count) => `Tienes ${count} mensajes nuevos`
12            }
13        };
14    }
15
16    async processNotifications(userName, messageCount) {
17        const notifications = [];
18        try {
19            const welcomeMsg = this.templates?.[this.language]?.welcome(userName);
20            notifications.push(welcomeMsg);
21
22            if (messageCount > 0) {
23                const msgNotification = this.templates[this.language].newMessage(messageCount);
24                notifications.push(msgNotification);
25            }
26
27            return Promise.all(notifications);
28        } catch (error) {
29            return ['Notification error occurred'];
30        }
31    }
32}
33
34const handler = new NotificationHandler('es');
35handler.processNotifications('Carlos', 3)
36    .then(console.log);