To keep the promise chain going, you can’t use setTimeout() the way you did because you aren’t returning a promise from the .then() handler – you’re returning it from the setTimeout() callback which does you no good. Instead, you can make a simple little delay function like this: And, then use it like this: Here … Read more
At this point: the resis the result of promise uploadpicture function (that is the parsedBody), not the res from the express route. So indeed, it has no status function. Try change the then callback name like:
You need to be serving your index.html locally or have your site hosted on a live server somewhere for the Fetch API to work properly. The files need to be served using the http or https protocols. If you just clicked on your index.html from your file explorer than your browser is grabbing those files … Read more
The promise will always log pending as long as its results are not resolved yet. You must call .then on the promise to capture the results regardless of the promise state (resolved or still pending): Why is that? Promises are forward direction only; You can only resolve them once. The resolved value of a Promise is passed to its .then or .catch methods. … Read more
Sure the code does work, but I’m pretty sure it doesn’t do what you expect it to do. It just fires off multiple asynchronous calls, but the printFiles function does immediately return after that. Reading in sequence If you want to read the files in sequence, you cannot use forEach indeed. Just use a modern for … of loop instead, in which await will … Read more
I’m wondering if there is any way to get a value from a Promise or wait (block/sleep) until it has resolved, similar to .NET’s IAsyncResult.WaitHandle.WaitOne(). I know JavaScript is single-threaded, but I’m hoping that doesn’t mean that a function can’t yield. The current generation of Javascript in browsers does not have a wait() or sleep() that allows other things … Read more
Promise A Promise handles a single event when an async operation completes or fails. Note: There are Promise libraries out there that support cancellation, but ES6 Promise doesn’t so far. Observable An Observable is like a Stream (in many languages) and allows to pass zero or more events where the callback is called for each event. Often Observable is preferred over Promise because it provides the features of Promise and more. With Observable it doesn’t … Read more
You need to return your promise to the calling function.
I am using Discord.js and I have no idea how to get the value out of a Promise. Here is some context: and I get the output: My issue is that I can obviously get my username and print it to console, but I can’t get it out of the Promise. How do I get … Read more
Async arrow functions look like this: Async arrow functions look like this for a single argument passed to it: Async arrow functions look like this for multiple arguments passed to it: The anonymous form works as well: An async function declaration looks like this: Using async function in a callback: Using async method inside of a class: