Below code snippet I have taken from the famous YDKJS - Async & Performance series, and have made a few changes for the sake of understanding. var p3 = new Promise( function(resolve,reject){ resolve( "B" ); } ); var p1 =…
I'm using setTimeout as a Promise. But then I cannot cancel it using clearTimeout. THis is my code: const delay = (ms) => new Promise((res) => setTimeout(res, ms)); delay(1000).then(() => console.log("Done")); But using this approach I cannot cancel timeout using…
I'm struggling to come up with a dynamic solution, I have an array of items, I need to send a POST request for each item in the array, however I do not want to send the next request until the…
I have an async function async function f1 (){ some db operation return result } What is the difference between the two code await f1() .then((result)=> something1. Can I use result here?) vs f1() .then((result)=>something2. Can I use result here?)
I'm learning promise and async await, here I want to call addPost function and push an object twice and then I want to loop on that array of objects to see the results, but in this code the result is…
I was reading about nested promises and encountered this coding challenge in the tutorials. Can someone explain the execution order of this code? new Promise((resolve) => { new Promise((res) => { console.log("c"); resolve(3); res(2); }).then((response) => console.log(response)) }).then((res) => console.log(res));…
I have three URLs I need to access in my code. The first two will always be accessed, but the third one might be accessed zero, one or two times. As all URLs take a lot of processing, I don't…
I tried to write a function that requests only limited amount of mock endpoints at one time. As soon as one request is resolved, the next one is fetching. Here is my code: const requestQueue = (endpoints, callback, limit =…
In JavaScript, in the array of promises (can have n promises), run first n promises, when finished, run another n; Example: const promises = [Promise_1, Promise_2, Promise_3, Promise_4, Promise_5, Promise_6]; Run Promise_1 and Promise_2, when both finish, run Promise_3, Promise_4,…
So, I was recently introduced to the concept of promises and I was told for chaining purpose, we use 'then', which is actually invoked when the attached promise object is fulfilled. And, to do some work after this object is…