Comparing a NodeJS example rewritten as CoffeeScript

fs_stat.coffee

# CoffeeScript version of NodeJS example from http://nodejs.org/api.html#_file_system
sys: require('sys')
fs:  require('fs')
fs.rename "/tmp/hello", "/tmp/world", (err) ->
  throw err if err
  fs.stat "/tmp/world", (err, stats) ->
    throw err if err
    sys.puts "stats: ${JSON.stringify(stats)}"
    fs.rename "/tmp/world", "/tmp/hello", (err) ->
      throw err if err

fs_stat_raw.js

// NodeJS example from http://nodejs.org/api.html#_file_system
var fs = require('fs');
var sys = require('sys');
fs.rename("/tmp/hello", "/tmp/world", function (err) {
  if (err) throw err;
  fs.stat("/tmp/world", function (err, stats) {
    if (err) throw err;
    sys.puts("stats: " + JSON.stringify(stats));
    fs.rename("/tmp/world", "/tmp/hello", function (err) {
      if (err) throw err;
    });
  });
});