verbose coordination of async operations on a sequence

gistfile1.js

function readSource(after) {
  var remainingWork;
  var fileContents;

  console.log('Reading source files...');
  remainingWork = settings.src.length;
  fileContents = new Array(remainingWork);

  settings.src.forEach(function(f, index) {
    fs.readFile(f, function(err, data) {
      fileContents[index] = {'file': f,
			     'data': data};
      remainingWork = remainingWork - 1;
      if ((remainingWork === 0) && after) after(fileContents);
    });
  });
}