.Then Callback vs .Catch and how they're scoped

CatchOrCallback.js

Promise.resolve()
  .then(() => {
    throw new Error('This will be handled in the next .then(, err), OR in a .catch'); // comment this line to see the next error handled
  })
  .then(() => {
    throw new Error('This will only be handled in a .catch');
  }, error => {
    // an alternative to .catch with less scope
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then
    // thus, with this method there's a block of code where errors could be left unhandled
    console.error('onRejected function called: ' + error.message);
  })
  .catch(error => {
    // catch without onRejected will handle both error scenarios
    console.error('Catch function called: ' + error.message)
  });