q31.ts

// Checking Usernames: Do the following to create a program that simulates how websites ensure that everyone has a unique username.
// • Make a list of five or more usernames called current_users.

// • 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.

// • 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.

// • Make sure your comparison is case insensitive. If 'John' has been used, 'JOHN' should not be accepted.

let current_users: string [] = ['eric', 'willie', 'admin', 'erin', 'Ever']
let new_users: string [] = ['sarah', 'Willie', 'PHIL', 'ever', 'Iona']
 
let current_users_lower: string [];
current_users_lower = [];

for(var i=0; i<current_users.length; i++){
    current_users_lower[i] = current_users[i].toLowerCase();
}

for(var i=0; i<new_users.length; i++){
    if(new_users[i].toLowerCase() === current_users_lower[i]){
        console.log(`Sorry  + ${new_users[i]} + ", that name is taken.`);
    }
    else{
        console.log(`Great, ${new_users[i]} is still available`);
    }
}