An example of async and await when compared to callbacks.

Async-example.js

//Async Await Example JS

//Server Data
const cats = {
  Tim: {breed: "Persian"},
  Meowth: { breed: "Meowth" },
  Terry: {breed: "Bob Cat"}
}

//Call back Example
function getCatBreed(catName, callback) {
  callback(cats[catName].breed);
}

function logUpperCaseBreed(catName) {
  //Write callback function to log breed
  getCatBreed(catName, function (breed) {
    console.log(breed.toUpperCase());
  })
}

//Output cat breed
getCatBreed("Tim", function (breed) {
  console.log(breed);
});

//Output uppercase breed
logUpperCaseBreed("Tim");

//Async Await
async function getCatBreed2(catName) {
  return cats[catName].breed;
}

async function logUpperCaseBreed2(catName) {
  //get the data and simple console.log
  const breed = await getCatBreed2(catName);
  console.log(breed.toUpperCase());
}

//Output cat name
getCatBreed2("Tim").then(breed => { console.log(breed) });

//Output uppercase breed
logUpperCaseBreed2("Tim");