Functions

class user {
    constructor(name, accountType, online) {
        this.name = name;
        this.accountType = accountType;
        this.online = true;
    }
}
let firstUser = new user("Cyrille", "premium", true);
let secondUser = new user("Mathieu", "normal", false);
let thirdUser = new user("Gilles", "premium", true);
 
const sendWelcomeMessageToUser = (user) => {
       if (user.online) {
              if (user.accountType === "normal") {
                     console.log("Hello " + user.name + "!");
              } else {
                    console.log("Welcome back premium user " + user.name + "!");
              }
       }
}
sendWelcomeMessageToUser(firstUser);
sendWelcomeMessageToUser(secondUser);
sendWelcomeMessageToUser(thirdUser);