Learning Javscript

Learning Javscript

var dataBase = [{
        username: "User 1",
        password: "pass@user1"
    },
    {
        username: "User 2",
        password: "pass@user2"
    },
    {
        username: "User 3",
        password: "pass@user3"
    },
    {
        username: "User 4",
        password: "pass@user4"
    }
]
var timeLine = [
    {
        name: "User1",
        message: "Hey I am user 1"
    },
    {
        name: "User2",
        message: "Hey I am user 2"
    },
    {
        name: "User 3",
        message: "Hey I am user 3"
    },
    {
        name: "User 4",
        message: "Hey I am user 3"
    }
]


function checkPass(user, pass) {
    for (var i = 0; i < dataBase.length; i++) {
        if (user === dataBase[i].username && pass === dataBase[i].password) {
            console.log('Success');
            return true;
        }
    }
    return false;

}

function signIn(user, pass) {
    if (checkPass(user, pass)) {
         console.log('Welcome to Facebook');
        console.table(timeLine);
    } else {
         return alert('Sorry Wrong username or password');
    }
}
do {
    var userInput = prompt('What would you like to do?')
    if (userInput === "login") {
        var emailId = prompt('Your username');
        var passWord = prompt('Your password');
        signIn(emailId, passWord);
    }
}
while (userInput !== "exit");