Is there a way to short circuit async/await flow?

Question

async function update() {
   var urls = await getCdnUrls();
   var metadata = await fetchMetaData(urls);
   var content = await fetchContent(metadata);
   await rend         


        

Answer 1

Just like in regular code you should throw an exception from the first function (or each of the next functions) and have a try block around the whole set of calls. No need to have extra if-elses. That's one of the nice bits about async/await, that you get to keep error handling the way we're used to from regular code.

Wrt cancelling the other operations there is no need to. They will actually not start until their expressions are encountered by the interpreter. So the second async call will only start after the first one finishes, without errors. Other tasks might get the chance to execute in the meantime, but for all intents and purposes, this section of code is serial and will execute in the desired order.