step.js

var Step = require('step');

Step(
  function readSelf() {
    fs.readFile(__filename, this);
  },
  function capitalize(err, text) {
    if (err) {
      throw err;
    }
    return text.toUpperCase();
  },
  function showIt(err, newText) {
    sys.puts(newText);
  }
);