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

You can't return the result from a function whose execution is asynchronous.

The simplest solution is to pass a callback :

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

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