WebApr 10, 2024 · That return is not related callback function of the Promise: (resolve, reject) => { // ... } It belongs belongs to the arrow function, passed to the setTimeout => { reject(); return; } and for that reason, only exits that function, and being the last statement in that function and not returning anything it is useless. WebFeb 5, 2024 · Ultimately, promises tell us something about the completion of the asynchronous function we returned it from–if it worked or didn’t. We say the function was successful by saying the promise resolved, and unsuccessful by saying the promise rejected. const myPromise = new Promise (function (resolve, reject) {}); console.log …
JavaScript Promise and Promise Chaining - Programiz
WebDec 15, 2024 · The new Promise () constructor returns a promise object. As the executor function needs to handle async operations, the returned promise object should be … WebCreate a Promise. To create a promise object, we use the Promise () constructor. let promise = new Promise(function(resolve, reject){ //do something }); The Promise () constructor takes a function as an argument. The function also accepts two functions resolve () and reject (). If the promise returns successfully, the resolve () function is called. cpa bec exam
Timers Node.js v19.9.0 Documentation
WebSep 21, 2024 · The fetch() method returns a Promise. After the fetch() method, include the Promise method then(): fetch (url). then (function {// handle the response}) If the Promise returned is resolve, the function within the then() method is executed. That function contains the code for handling the data received from the API. After the then() method ... WebApr 5, 2024 · The API design of promises makes this great, because callbacks are attached to the returned promise object, instead of being passed into a function. Here's the magic: the then () function returns a new promise, different from the original: const promise = … The methods Promise.prototype.then(), Promise.prototype.catch(), and … cpa bec format