simpleCallback.md

// get Data from a URI and then run whatever function we want using that data

function getData(dataURI, thingToRun) {
  var myData = getSomeData();
  thingToRun(myData);
}
// the function we're passing as a callback

function logData(data) { console.log(data); }

// passing logData as a callback

getData('http://eff.org', logData);