block19.js

.then(() => 5.length) // <-- something wrong happenned here
.catch(e => {
  	errorLogger(e); // do something impure
  	return Promise.reject(e); // reject it, Yes you can do that!
})
.then(r => {
	console.log(r); // this .then (or any subsequent .then) will never be called as we rejected it above :)
})
.catch(e => {
	console.error(e); //<-- it becomes this catch's problem
})