settimeout-setimmediate-nexttick.js

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

const start = Date.now();

setImmediate(() => console.log('this is set immediate 1'));
setImmediate(() => console.log('this is set immediate 2'));
setImmediate(() => console.log('this is set immediate 3'));

setTimeout(() => console.log('this is set timeout 1'), 0);
setTimeout(() => {
    console.log('this is set timeout 2');
    process.nextTick(() => console.log('this is process.nextTick added inside setTimeout'));
}, 0);
setTimeout(() => console.log('this is set timeout 3'), 0);
setTimeout(() => console.log('this is set timeout 4'), 0);
setTimeout(() => console.log('this is set timeout 5'), 0);

process.nextTick(() => console.log('this is process.nextTick 1'));
process.nextTick(() => {
    process.nextTick(console.log.bind(console, 'this is the inner next tick inside next tick'));
});
process.nextTick(() => console.log('this is process.nextTick 2'));
process.nextTick(() => console.log('this is process.nextTick 3'));
process.nextTick(() => console.log('this is process.nextTick 4'));

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

function doHash() {
  crypto.pbkdf2('a', 'b', 100000, 512, 'sha512', () => {
    console.log('Hash:', Date.now() - start);
  });
}

doRequest();


fs.readFile('multi', () => {
   console.log('FS:', Date.now() - start);
   setTimeout(() => {
       console.log('timeout')
   }, 0);
   setImmediate(() => {
       console.log('immediate')
   })
});

doHash();
doHash();
doHash();
doHash();