Cancelable Promise: Write a JavaScript function that creates a cancellable Promise by using a custom wrapper. Solution-1: Code: // Function to create a cancellable PromisefunctioncreateCancelablePromise(executor){letcancel;constpromise=newPromise((resolve,reject)=>{cancel=()=>reject(newError('Promise...
How to use Promise and setTimeout to mock an API call in JavaScript All In One 如何使用 Promise 和 setTimeout 在 JavaScript 中模拟一个 API 调用 argslistversion constgetMockData=async(data ='', error ='unknown server error', delay) => {returnnewPromise((resolve, reject) =>{setTimeout...
How to use promises in JavaScript Promises are one way to deal with asynchronous code in JavaScript, without writing too many callbacks in your code.Introduction to promises How promises work, in brief Which JS API use promises? Creating a promise Consuming a promise Chaining promises Example ...
In JavaScript, promise.resolve is a method that creates a new Promise object that is resolved with a given value. This method is often used when working with
The API you call usingfetch()may be down or other errors may occur. If this happens, therejectpromise will be returned. Thecatchmethod is used to handlereject. The code withincatch()will be executed if an error occurs when calling the API of your choice. ...
In the example above, we first declare a function that returns a new promise that resolves to a value after one second. We then create an async function and wait for the promise to resolve before logging the returned value to the console....
In this tutorial, we’ll demonstrate how to make HTTP requests using Axios in JavaScript with clear examples, including how to make an Axios request with the four HTTP request methods, how to send multiple requests simultaneously with Promise.all, and much more. TL;DR: What is Axios? Axios...
By itself,setTimeout()does not work as asleep()function, but you can create a custom JavaScriptsleep()function usingasyncandawait. Taking a different approach, you can pass staggered (increasing) timeouts tosetTimeout()to simulate asleep()function. This works because all the calls tosetTimeout...
You can do the same with a for..in loop to iterate on an object:const fun = (prop) => { return new Promise(resolve => { setTimeout(() => resolve(`done ${prop}`), 1000); }) } const go = async () => { const obj = { a: 1, b: 2, c: 3 }; for (const prop in...
In the above example, the AbortController is used to create an AbortSignal object, which is passed as an option to the fetch() request. When the AbortController.abort() function is called while the fetch request is in progress, the request is canceled and an AbortError is thrown: ...