/*
•	Checking Usernames: Do the following to create a program that simulates how websites ensure that everyone has a unique username.
o	Make a list of five or more usernames called current_users.
o	Make another list of five usernames called new_users. Make sure one or two of the new usernames are also in the current_users list.
o	Loop through the new_users list to see if each new username has already been used. If it has, print a message that the person will need to enter a new username. If a username has not been used, print a message saying that the username is available.
o	Make sure your comparison is case insensitive. If 'John' has been used, 'JOHN' should not be accepted.
*/
let current_users: string[] = ["john", "alice", "bob", "charlie", "david"];
let new_users: string[] = ["eric", "ALICE", "mike", "david", "sarah"];

for (let new_user of new_users) {
    let usernameTaken: boolean = false;
    for (let current_user of current_users) {
        if (new_user.toLowerCase() === current_user.toLowerCase()) {
            usernameTaken = true;
            break;
        }
    }
    if (usernameTaken) {
        console.log(`Sorry, ${new_user} is already taken. Please enter a new username.`);
    } else {
        console.log(`${new_user} is available.`);
    }
}