I guess `held` would be like an arrow function, "transparent" when it comes to held invokes (like context or arguments)
On Thu, Dec 3, 2015 at 5:23 PM, Claude Pache <[email protected]> wrote: > How would you detect that the following call to your `fileGetContent` > function should return a Promise? > > ```js > function oldSchool() { > return fileGetContent("foo").then(function (c) { > // .... > }) > } > ``` > > —Claude > > > > Le 3 déc. 2015 à 13:15, Andrea Giammarchi <[email protected]> > a écrit : > > > > Hi there, > > just writing down some thoughts about being able to understand if a > method/function has been executed within a generator/async and is being > yielded/awaited. > > > > Rationale: API that would like to behave synchronously in some case, > returning Promises in other cases. > > > > Example: > > > > ```js > > function fileGetContent(fileName) { > > // random example > > if (held) { > > return fetch(fileName).then((r)=>r.text()); > > } else { > > var xhr = new XMLHttpRequest; > > xhr.open('GET', fileName, false); > > xhr.send(null); > > return xhr.responseText; > > } > > } > > ``` > > > > Above example will virtually return always the same type and it could > work inside a generator or an async function as long as it's being held. > > > > Does any of this make sense? Is it worth exploring this pattern? > > > > Thanks for any sort of thought. > > > > Best Regards > > > > > > > > > > _______________________________________________ > > es-discuss mailing list > > [email protected] > > https://mail.mozilla.org/listinfo/es-discuss > >
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