dynamic callback answer example

net.js

fs = require('fs');
var sandbox = {};

vm.runInNewContext(data, sandbox);

socket.on('data',function(data){
  // after proccessed data, left the callback function name.
  callback = JSON.parse(fs.readFileSync('./' + data));
  callback.fn();
});

// ------

var callback = require('./callback');

socket.on('data',function(data){
  // after proccessed data, left the hash to match callback function
  callback[data]();
});