setImmediate vs setTimeout vs process.nextTick

set-tick.js

const fs = require('fs');

fs.readFile(__filename, () => {
  setTimeout(() => {
    console.log('SetTimeout callback');
  }, 0);
  setImmediate(() => {
    console.log('SetImmediate callback');
  });

  process.nextTick(() => { 
    console.log('NextTick'); 
  });
});

// Output:
// NextTick
// SetImmediate callback
// SetTimeout callback