multitasks.js

const https = require('https');
const crypto = require('crypto');
const fs = require('fs');

const start = Date.now();

function doRequest(){
  https
  .request('https://www.google.com', (res)=>{
    res.on('data',()=>{});
    res.on('end',()=>{
      console.log('Request', Date.now() - start);
    });
  })
  .end();
}

function doHash(){
  crypto.pbkdf2('a', 'b', 100000, 512, 'sha256', ()=>{
    console.log('Hash:', Date.now()-start);
  });
}

doRequest();

fs.readFile('multitask.js', 'utf-8', ()=>{
  console.log('FS:', Date.now() - start);
})

doHash()
doHash()
doHash()
doHash()