Sqlite .all() function returns an undefined promise. How can I use the result further?

I am just starting to work with JS and SQLite. And could not find any help for my specific question. I want to keep a return to use it as a foreign key in a second table. This is my function: What do I have to do so that promise does not stay undefined outside of the function? Rest of the code: My other function just creat some strings and I run a few times db.run(…) to add some tables. Answer To put it more plainly, your getIdByName function never returns anything. You need to return the value you get

Google Cloud Function async with multiple fetch requests

I’m new to both GCF and Javascript async and have been struggling with this. I perform a fetch call initially and then pass that response as a parameter to a second function which then also performs a separate fetch call. During the second function, my empty initialized json gets properties added to it, and when that function completes, I want to notify the exports.helloHttp to then do res.end and terminate. I’ve tried chaining an additional empty then() but it doesn’t seem to be working. My code: Answer Here is the code that would do what you want (replace the fetch

Difference between synchronous and asynchronous functions

I have just started react-native development and came across async functions. Can someone explain a thing or two about it in layman’s terms. I have tried reading articles on it but they all tend to explain it in a very technical way which is a little confusing. I have used other languages but javaScript is not my cup of tea. My doubts are: which one acts more like a normal function, synchronous or asynchronous function? while reading this article https://blog.expo.io/react-native-meets-async-functions-3e6f81111173 he talks about returning promises and awaiting response. so in this what is a promise and also if we are

Javascript: Error in Promise implementation

I’m trying to perform async function and then console log the results with the help of Promise. I’m afraid I haven’t quite grasped the concept yet. I wanted to wait till getlinks finished performing tasks and then console log the result. But the it logs the result as empty even before the getlink is finished. Answer The simplest answer is you’re promise is resolving (return resolve(utlUrls)) before your async code (axios.get(…).then(…)) completes. This is a minimal example to reproduce your problem: It doesn’t work because we return ultUrls before we’ve filled it. We don’t wait for the timeouts to complete.

Promises returned data ”

my data which is fetched from youtube is using nodejs is – Now I want to search 5 related videos to each video my api and api to 5 related Videos is given below It is giving the output like How to solve this pending problem or how to wait so it gets full data. Answer It happens because you assign the promise returned by relatedVideos() to the property relatedVideos, you never actually wait for it to resolve. You need to await all of the promises before you proceed, this is most easily done with Promise.all(). Let’s focus on this

why is async-await much slower than promises when running them together

I found out that running async-await can be much slower in some scenarios. IMO, the console.log in usingPromises should print similar results to the one in usingAwait. But in reality, I get: Total (promises): 0.25 ms Total (await): 2.065 ms Also, after the page load, if I click on ‘usingPromises’ or ‘usingAwait’ button I get similar results for each of them. (both are fast when running alone) Total (promises): 0.060000000026775524 ms Total (await): 0.08999999999650754 ms But if I click on the ‘both’ button, the ‘await’ version is ~3-4 times slower than the promises version. I have a real application running

When to close MongoDB database connection in Nodejs

Working with Nodejs and MongoDB through Node MongoDB native driver. Need to retrieve some documents, and make modification, then save them right back. This is an example: With asynchronous nature, if the process of updating the document takes longer, then when cursor reaches the end of documents, database connection is closed. Not all updates are saved to the database. If the db.close() is omitted, all the documents are correctly updated, but the application hangs, never exits. I saw a post suggesting using a counter to track number of updates, when fall back to zero, then close the db. But am

load scripts asynchronously

I am using several plugins, custom widgets and some other libraries from JQuery. as a result I have several .js and .css files. I need to create a loader for my site because it takes some time to load. it will be nice if I can display the loader before importing all the: I have found several tutorials that enable me to import a JavaScript library asynchronously. for example I can do something like: for some reason when I do the same thing for all my files the pages does not work. I have been trying for so long to