asynchronous require in node

asynchronous require in node

/* i needed to load a bunch of static filter arrays into an api route in node - express - 
so rather than making that DB call every time i ran the 
api route here is a keen pattern to require async - use require with a callback.
This is a quick and easy way to do "poor man's server caching" with node in a server context
*/

require('./apiHelper').getOptFilter(function(err, filter){
   console.log('i got the filter now load the rest of my route/module', filter); 
});

//then in your helper module
module.exports = {
  getOptFilter: function(callback) {
    //do something asyncy
	  filterCollection.find({}).exec(function(err, filterObjs) {
    
      //use your callback and send err , your data
      
      callback(err,filterObjs.map(function(v){return v.code;}));
	});
  },
};