I'm trying to understand how promises work under the hood in JS and faced with this example: const promise = Promise.reject(); promise .catch(() => console.log(1)); promise .catch(() => console.log(2)); // Output: // 1 // 2 const promise = Promise.reject(); promise…
I'm new to javascript and I have a question about promise chaining. I have two promises and want to return a promise that executes P2 after P1 regardless of whether P1 succeeded or failed, and return a Promise<number> as per…
I know there are plenty of resources explaining for await...of, but I don't think I'll ever fully grasp the concept until I see an example that works the exact same way but with more basic syntax. Thing is, if my…
(See also this answer.) When I redefine the Promise class (with a "monkey-patch" as shown below), this does not affect promises that are returned by a native function like fetch: Promise = class extends Promise { constructor(executor) { console.log("Promise created");…
I have several functions that call each other asyncronously, and I need to catch a situation when last functionis called. await statement supposes to call a function I should wait, but it is not to be called directly function First(){…
How can I effectively manage multiple asynchronous data fetch requests in JavaScript using the Fetch API? I want to create an array of fetch requests, each returning a promise, and ensure that all results are processed before proceeding. What’s the…
Let's say I have async functions calling external APIs with variable response times defined as below: async function promise1() { /* API Call */ } async function promise2() { /* API Call */ } async function promise3() { /* API…
For the below posted code, I collect the Promises in both of the arrayspromisesTS1 and promisesTS2. I want the collected promises to be executed later when i call or execute something like the following: individualBandsDataForPathForTS1.map(async data => { data.map(load =>…
I actually consume some remote API using the FETCH API like below document.addEventListener("DOMContentLoaded", () => { loadCart(); aggregateSearch("france", ["api1", "api2"]); }); const aggregateSearch = async (term, AvailableApis) => { console.log("aggregateSearch") await Promise.all(AvailableApis.map((api) => { fetchApi(api, term); })) }; const fetchApi…
I was trying to use Promise to test different ways of using Promise then I encountered these problems. I thought that the result will wait for 3000ms then print hello world 1 and then continuously wait for 2000ms to print…