async/await and return

gistfile1.js

async function waitAndMaybeReject() {
  // Wait one second
  await new Promise(r => setTimeout(r, 1000));
  // Toss a coin
  const isHeads = Boolean(Math.round(Math.random()));

  if (isHeads) return 'yay';      // comment out when error
  throw Error('Boo!');
}

async function foo() {
  try {
    waitAndMaybeReject();
  }
  catch (e) {
    return 'caught';
  }
}
/**
  normal:
    undefined 11

  error:
    (node:6359) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Boo!
    (node:6359) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
*/

async function foo_await() {
  try {
    await waitAndMaybeReject();
  }
  catch (e) {
    return 'caught';
  }
}
/**
  normal:
    caught 11

  error:
    caught 11
*/

async function foo_return() {
  try {
    return waitAndMaybeReject();
  }
  catch (e) {
    return 'caught';
  }
}
/**
  normal:
    yay 11

  error:
    Error: Boo!
*/

async function foo_return_await() {
  try {
    return await waitAndMaybeReject();
  }
  catch (e) {
    return 'caught';
  }
}
/**
  normal:
    yay 11

  error:
    caught 11
*/


foo()
// foo_await()
// foo_return()
// foo_return_await()
  .then((ret) => {
    console.log(ret, 11)
  })
  .catch((err) => {
    console.error(err)
  })