callbackDemo_03.js

var results = {};
function checkInDatabase(callback){
  results.checkresult = SomeComputationThatTakesTime();
  callback();
}
function crawl(callback){
  results.crawlingResult = SomeComputationThatTakesTime();
  callback();
}
function extractData(callback){
  results.data = SomeComputationThatTakesTime();
  callback();
}
function saveData(callback){
  results.dbAcknowledgementMessage = SomeComputationThatTakesTime();
  callback();
}
function displayProcessResult(){
  console.log(results);
}

function process (){
  checkInDatabase(function(){
    crawl(function(){
      extractData(function(){
        saveData(function(){
          displayProcessResult();
        });
      });
    });
  });
}