在等待异步函数时，是否需要显式捕获并重新抛出异常？

Question

If I have

async function bar() {
  throw 'bar';
}

What's the difference between

async function foo() {
  await bar();
}

and

async function foo() {
  try {
    await bar();
  } catch(e) {
    throw e;
  }
}

I heard that I need to explicitly catch and re-throw exceptions inside asynchronous functions, but I assumed catch(e) { throw e; } catch(e) { throw e; } is redundant (if there's no extra processing or logging done before the exception is thrown again). I believe that's how it is in some other languages; what about JavaScript?

Answer 1

You do not have to catch and rethrow. If the expression is a promise that rejects, the expression will throw the value of the rejection.

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