Javascript Global Variables Unreachable From Outside an "IF-ELSE" Block

JavaScript
1

Hello Earthlings :slight_smile:

I have an interesting problem that I would very much appreciate help with. You what has gone and happened is this, I have created a method inside my lovely Class, the method’s job is to read an online database, Firebase’s CloudFireStore - yeah I’m also expecting a flaming phoenix to fly across the horizon every time I mention Firebase :slight_smile:

The method is getting the data as expected but, can write it to console, there is trouble in paradise when I try to reuse the variable outside of the “if-else” statement I am using to confirm the data, is this weird or what!!! I bet it’s what :slight_smile:

fireNewStudent(){

        let lastStudentNum = db.collection("control").doc("lastStudentNum");
        let StudentNum;

        lastStudentNum.get().then(function(doc){
            if (doc.exists){
                currentStudentNum = doc.data();
                StudentNum = currentStudentNum.lastStudentNum;
                console.log(StudentNum);
                // Prints expected result
            } else{
                // doc.data will be undefined in this case
                console.log("Error getting current student number");
            }
        }).catch(function (error) {
            console.log("Error getting document: ", error)
        });

        document.write(JSON.stringify(currentStudentNum));
        //Prints out an empty object  => {}

}

Thanks a bunch for having a look and hope to hear from you soon :slight_smile:

2

Can you include a screenshot of the exact console error message you’re getting?

4

Randell, my man! That is it, thanks a bunch. Once I realised the error of my ways it all became clear aas day light. Thank you all for having a look.

5

The console wasn’t returning an error, simply returning an empty object. Thanks for having a look :slight_smile: