Calling async function during line processing

[jochenonline]

Hello!

Very nice package, really! How can I call an async funtion (i.e. writing the line data to a database) during line processing? The problem for me is, that I want to call nextLine() in the callback of my async function. This does not work, because code is running forth in the meantime.

Thanks for your help.

[nickewing]

Hello Jochen,

I see the problem and you're right, the eachLine function did not really make this possible. I've updated the function to take a callback as the third paramater. I think it should work for what you're trying to do.

Example:

var lineReader = require('line-reader');

lineReader.eachLine('file.txt', function(line, last, cb) {
  console.log(line);

  if (/* done */) {
    cb(false); // stop reading
  } else {
    cb();
  }
});

Thanks for pointing that out!