Javascript Async Await

async_await.js

function fetch(url, callback) {
  console.log('Getting ' + url);
  var delay = (Math.round(Math.random() * 1E4) % 4000) + 1000
  var response = 'Content for ' + url;
  setTimeout(function() {
    callback(response)
  }, delay);
}

function promiseFetch(url) {
    return new Promise(function(resolve, reject) {
        fetch(url, function(data) {
            resolve(data);
        })
    })
}

async function main() {
    var data1 = await promiseFetch('file1');
    var data2 = await promiseFetch('file2');
    var data3 = await promiseFetch('file3');
    var data = JSON.parse( result1 );
    console.log(data1, data2, data3)
}

main();