Access To A Variable, Which Is Output From An Async Function

I have a problem with this snippet: d3.csv('data/airports.csv', function(err, a) { var count=0; a.forEach(function(i){ if(i.iata_faa == ''){} else {

Solution 1:

Generally for async functions, you push a callback (a function reference) into the async method, so that it processes the data when the ajax call completes. You don't return data from that type function, you inject data into it.