Return from callback function in Javascript

Question

How do I get the return value from inside a value of node.js/javascript callback?

function get_logs(){
    User_Log.findOne({userId:req.user._id}, function(err,          


        

Answer 1

function get_logs(callback) {
    User_Log.findOne({
        userId: req.user._id
    }, function (err, userlogs) {
        if (err) throw err;
        if (userlogs) {
            // logs = userlogs.logs;
            callback("hello there is a logs");
        } else {
            callback("there is no logs yet...");
        }
    })
}

get_logs(function (data) {
    console.log(data);
});

Uses callbacks...