How can I save data inside a variable that is defined outside of a function in javascript?

Asked Jun 23 '19 at 14:21

Active Jun 23 '19 at 14:24

Viewed 21 times

I am trying to save in a variable the data received from a request to a mongoDb database with this code:

var riskRatingTable = [];
RiskRating.find((err, tableData) => {
    if (err)
        console.log(err);
    else
    riskRatingTable = tableData;
});
//This returns undefined
console.log('riskRatingTable: ', riskRatingTable);

After having made some research, I have found that this solvable by using callback or promises: Solving js asynchronous functions problems So I tried this:

 var riskRatingTable = [];
    RiskRating.find((err, tableData) => {
        if (err)
            console.log(err);
        else
        riskRatingTable = tableData;
    }).then((tableData)=>{
        riskRatingTable = tableData;
s    });
    console.log('riskRatingTable: ', riskRatingTable);

But, I get this error:

(node:2916) UnhandledPromiseRejectionWarning: ReferenceError: s is not defined

Any idea how I can fix this?
Thank you !!

asked Jun 23 '19 at 14:21

Ahmed Ghrib

1

You didn't read the duplicate closely enough. You cannot access the value generated by the callback function before the callback function has run. – Quentin Jun 23 '19 at 14:27
I understand that. But, what's the solution?? – Ahmed Ghrib Jun 24 '19 at 08:15
To use the value inside the callback. – Quentin Jun 24 '19 at 08:18
Should I pas the riskRatingTable variable as an argument to the callback function? – Ahmed Ghrib Jun 24 '19 at 08:21
That doesn't make sense. You aren't calling the callback function, so you can't … and since you are defining the callback function in the scope that contains `riskRatingTable` … it already has access to it. – Quentin Jun 24 '19 at 08:23
Alright, do you advise me to use promises then? – Ahmed Ghrib Jun 24 '19 at 08:25
You're already using promises. – Quentin Jun 24 '19 at 08:25

How can I save data inside a variable that is defined outside of a function in javascript?

0 Answers0