Learnyounode juggling async solution using es6 promises

jugglingAsync.js

const http = require('http');
const urls = process.argv.slice(2, process.argv.length);

let fetchData = function(url){
    return new Promise(function(resolve, reject) { 
    http.get(url, (res)=>{
    let data = '';
    res.setEncoding('utf8');
    //res.resume();
    res.on('data',(chunk)=>{
        data += chunk;
    });
    res.on('end',()=>{
        resolve(data);
    })

   }).on('error',(e)=>{
        console.log(`error on: ${url}`);
        console.log(`Got error: ${e.message}`);
        reject(e);
    });  
});
}


let itemPromises = urls.map(fetchData);

Promise.all(itemPromises)
    .then(function(results){
      // we only get here if ALL promises fulfill
     results.forEach(function(item) {
        console.log(item);
       // process item
     });
    }).catch(function(err){
    console.log("Failed:", err);
});