node.js passing value to a variable in async mode

Question

My problem is the following:

I have a nice folder crawler function, which grabs the paths' of the files. I'm (I would like to) use these files for testing purposes.

1.) Grabbing the files 2.) Do some testing 3.) Job Done

This is the code where I call it:

            walk(csvRoot, function(err, results){
            if (err) throw err;
            for (var i = 0; i < results.length; i++) {
                return results[i] // - not working
            }
        });

My main issue is, that I really would like to pass the results to a variable, which will contain these paths as an array, but so far no luck.

The variable returns as undefined, that's what I'm trying to resolve currently.

Could you please advise how to do so?

Did you walk throw async module to avoid this issue or callback? — abdulbari
– abdulbari, Commented Oct 8, 2016 at 12:36

Stavros Zavrakas · Accepted Answer · 2016-10-08 12:24:01Z

1

Why do you use return within the for loop? What do you expect to return there? In any case, if you are expecting to have the results available outside of the scope of the walk function, it will not work. I pressume that you need something like that:

function getFiles (csvRoot, callback) {
  walk(csvRoot, function (err, results) {
    if (err) {
      return callback(err);
    }

    return callback(null, results);
  });
}

getFiles(csvRoot, functions (err, files) {
  // @todo: check for error

  console.log(files);
});

answered Oct 8, 2016 at 12:24

Stavros Zavrakas

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4 Comments

Gregion Over a year ago

It makes so much more sense now! Thank you for the quick and precise response!

Stavros Zavrakas Over a year ago

@Gregion If that was helpful, you can accept the answer :)

Gregion Over a year ago

I still have to wait 4 more minutes, to do so :)

Stavros Zavrakas Over a year ago

@Gregion You can try to shrink even more the get files function if you don't want to process the results at all into the walk callback function. It can be like that: function getFiles (csvRoot, callback) { walk(csvRoot, callback); }

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