how to reject wrapper promise from inside one or? in other words, how to make number ‘3’ never printed? Current output: Expected output: Answer It looks like you’re just missing a return
Tag: es6-promise
Javascript Array of Functions get auto executed
I need to make a sequence of Promises that are executed in a queue. They are dynamic so I need to put them in an array (I have found an article that explains how to). The problem is that my array of functions autoexecuted it self (version with a normal funciton): I don’t know why, an array of functions …
Firebase Realtime Database – Determine if user has access to path
I have updated my Firebase Realtime Database access rules, and have noticed some clients now tries to access paths they do not have access to. This is ok – but my problem is that my code stops after being unable to read a restricted node. I see below error in my console, and then loading of subsequent d…
Unexpected unhandledRejection event for promise which rejection does get handled
Updated, I’ve now tried explaining the behavior I’m seeing, but it’d still be great to have an answer from a credible source about the unhandledRejection behavor. I’ve also started a discussion thread on Reddit. Why do I get an unhandledRejection event (for “error f1”) in t…
Await functions but do them synchrony, then call the last function
So I am working with Vue, Node and typescript. I am fetching data that all my other functions are needing, so getDataForFunction123() needs an await and its fine. Then I have 3 functions that is fetching different stuff, not depending on each other. But all answers is used by the last function updateAfterFunc…
Resolving an array or promises and getting the result
I’m attempting to map and format data to render it into a table. I have an array of promises that I’m attempting to resolve with Promise.all(). but it seems to not be returning the result of the promise. my code is as follows: my data copy variable only returns as : where the result is the correct…
Filtering an array returned from Promise
I am porting the following code: Current version should use SerialPort.list(), which returns a promise. So far, I tried something along these lines, without success: Obviously I am not quite getting what I should do. So the question is: how should I represent the same intent of former FindDevices function, us…
Javascript: how to create an infinite-loop of promises?
I want to write in Javascript the following pseudo-code: I’ll explain it in words: asyncOperation uses a Promise, for example an AJAX call. I want that if the promise is rejected, then asyncOperation will be invoked again. Do you know how it can be done in Javascript? Answer If you’re going to use…
Two promises with a single then for either one of them
I have a function that takes an input, according to that input it will either call one of two functions (both return a promise) I want then to call the same .then() after whatever of them happened. I found Promise.any() but that doesn’t quite do what I want. For curious minds : I am working on a react-n…
UnhandledPromiseRejectionWarning : error handling in an async callback function
I have an async callback function, which throws an error if some condition isn’t met. but I get the below error (node:77284) UnhandledPromiseRejectionWarning: Error: Not Found UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async funct…