Return variable outside of a function scope in Javascript [duplicate]

Question

I tried all the solutions posted here, but nothing worked, because my problem is a bit different.

I have the following code (calls on a code from external neo4j module to insert a node into Neo4J database and then gets the Neo4J Id of that node):

dbneo.insertNode({
    auth_id: user.id,
    username: user.name,
    name: user.name
},function (err, node){
    if(err) throw err;
    // Output node properties.
    console.log(node.data);
    // Output node id.
    console.log(node.id);
});

All works fine, but how do I deliver node.id outside of the scope of function (err,node) to then add this value to another object?

When I try to do something like

user.neo_id = node.id;

after that block of the code above, it's undefined (of course).

Tried to run the dbneo.insertNode inside a named function, but if I put the return value into function (err, node) it's undefined anyway.

Sorry if the question is a bit simple/stupid, but I'm just starting in JavaScript. Thank you!

you should either use async module to achieve this, combine multiple calls and have one result. or entirely depend on events which is inconvenient — Gntem
– Gntem, Commented Feb 5, 2014 at 17:03
is there no easier way of just taking out that node.id variable from the function into the context? i mean it's such a small thing, surely there should be a way, no? :) — Aerodynamika
– Aerodynamika, Commented Feb 5, 2014 at 17:10

Aerodynamika · Accepted Answer · 2014-02-05 17:27:52Z

Ok, so after your advice, I have this interim code. Probably not the best (may clog), but it resolves the problem.

I simply call for the next function only after I'm sure I received the variable (node.id) from Neo4J database. If anyone knows a more elegant solution, please, do let me know (especially with async library).

 dbneo.insertNode({
    auth_id: user.id,
    username: user.name,
    name: user.name
},function (err, node){
    if(err) throw err;
    // Output node properties.
    console.log(node.data);
    // Output node id.
    console.log(node.id);

    // RECEIVED node.id ? ONLY THEN SEND IT TO THE FUNCTION THAT NEEDS IT
    send_neo_id(node.id);
});


// THIS IS THE FUNCTION THAT WAS NOT RECEIVING NODE.ID BEFORE:

function send_neo_id(neo_id) {
    user.neo_id = neo_id;
    db.set('user:id:' + user.name, id, function(err) {
        if (err) return fn(err);
        db.hmset('user:' + id, user, function(err) {
            fn(err);
        });
    });
};

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