node.js callbacks

callbacks.js

var asyncFunction = function(arg, callback) {
  anotherAsync(function(err, res) {
    if (err) return callback(err);
    var returnValue = res + 1;
    callback(null, returnValue);
  });
};

var callbacks = require('asunder').split;

var asyncFunction = function(arg, callback) {
  anotherAsync(callbacks(callback, function(res) {
    var returnValue = res + 1;
    callback(null, returnValue);
  }));
};

var asyncFunction = function(arg, callback) {
  a.split(anotherAsync)(callback, function(res) {
    var returnValue = res + 1;
    callback(null, returnValue);
  }));
};