[apeace]

I find the `async` library excels at this:

  var fs = require('fs');
  var async = require('async');
  async.waterfall([
    (cb) => fs.readFile('foo.txt', cb),
    (data, cb) => my_function(data, cb),
    (result, cb) => myDb.lookup(result, cb),
  ], (err, finalResult) {
    if (err) {
      console.error(err);
    } else {
      console.log(finalResult);
    }
  });

There are all sorts of helpful async primitives in there. I don't write Javascript without it!

Here is a link to the documentation: https://github.com/caolan/async