Get Logged in User name using jQuery in SharePoint

function getUserInformation() {
    var context = new SP.ClientContext.get_current();
    var web = context.get_web();
    var currentUser = web.get_currentUser();
    currentUser.retrieve();
    context.load(web);
    context.executeQueryAsync(

    function() { //On success function
        var userObject = web.get_currentUser();
        var email = userObject.get_email();
        var id = userObject.get_id();
        var loginName = userObject.get_title();
        return loginName;
    },

    function() { //On fail function
        alert('Error: ' + args.get_message() + '\n' + args.get_stackTrace());
    });
}