I have been a bit stuck on an Async function. What I am trying to accomplish – I am creating a batchProcessing function (batchGetSubs) which will loop through a set of files, read a ID, then make an API request, wait for a response (THE ISSUE) and then to write to a new file with the formatted data. The…
Tag: promise
Promise D3 js inside ‘then’
Trying to understand the different steps to the Promise implementation for D3 js. Have two input files and promise them all: The array has been consolidated into one individual input, which might be called as a one-parameter function like: Imagine I want to implement the second function as a two-parameter wit…
QuerySnapshot.empty causes a promise rejection error
I have a back-end using firebase-admin and express to allow post requests from the client to the server to make changes to the firestore I have that contains stuff like user data (this is a test and not a real product). I want to check if a document already exists so a user cannot register with that username …
What’s the correct way to handle promise rejections so that the function exits?
Let’s say that I have this code: If foo returns a rejected promise, then I’d like to exit doSomething(), but the code above does not do this. Instead since the error is caught, the code continues. If I do not catch the rejected promise then I get an error: UnhandledPromiseRejectionWarning: I know …
Browser shows get request is made but nothing is returned in promise?
Currently stumped on an issue and not finding anything online to help me out. I am making a very basic HTTP get request to get a JSON object from an API I made (express+CORS enabled). I’ve tried with both Axios and VueResource but having the same issue where my browser shows that the request is made and…
Getting location from another file using Promise in react native with react-native-geolocation-service
I’m trying to make a helper function to get the current location of the user, but the result of my promise is undefined. This function is working and I can retrieve my coordinates : But when I call my function here, I get undefined : What am I doing wrong? Answer As written, getUserLocation() does not r…
Why then doesn’t keep the order of the callbacks?
I have the following code: I thought that the output should be first ‘123’ and then ‘should wait’. From unclear reason the ‘should wait’ is printed first. I thought that the second then won’t start until the asynchrony function (setTimeout) won’t finished. I rea…
Electron, Javascript: How to select an array within an array returned by the database
I want to foreach an array to show on the screen. This array is the data from a database table. The code to get this data: But this variable comes this way: And I’m not able to select that array (_rejectionHandler0) Answer Since .query also returns a Promise, you need to await it. await conn waits for t…
Promise never gets resolved in javascript
I have a asyn function in which I call another function that return a promise and also calls to another async function. Here is the code: since I have some asynchronous code to execute so I cannot invoke resolve() directly. so I use call back and the animate function itself is async doing a bunch of asynchron…
Javascript: using catch block but not to handle an error
I’m in a situation where I have to use a catch block to execute some code but I don’t want to consider it an error. Basically, I want to update/create a user based on whether the user is already registered or not respectively. The admin sdk let me create a user, and if the user already exists it t…