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

This answer I posted may help you to rewrite your function as:

async function update() {
   var get_urls = comPromise.race([getCdnUrls()]);
   var get_metadata = get_urls.then(urls=>fetchMetaData(urls));
   var get_content = get_metadata.then(metadata=>fetchContent(metadata);
   var render = get_content.then(content=>render(content));
   await render;
   return;
}

// this is the cancel command so that later steps will never proceed:
get_urls.abort();

But I am yet to implement the "class-preserving" then function so currently you have to wrap every part you want to be able to cancel with comPromise.race.