IT Nursery
for (let i = 0; i < 10; i++) { const promise = new Promise((resolve, reject) => { const timeout = Math.random() * 1000; setTimeout(() => { console.log(i); },...
I have a pure JavaScript Promise (built-in implementation or poly-fill): var promise = new Promise(function (resolve, reject) { /* ... */ }); From the specification, a Promise can be...
I would like to clarify this point, as the documentation is not too clear about it; Q1: Is Promise.all(iterable) processing all promises sequentially or in parallel? Or, more specifically,...
Looking at MDN it looks like the values passed to the then() callback of Promise.all contains the values in the order of the promises. For example: var somePromises =...
I’m building a frontend app with React and Redux and I’m using axios to perform my requests. I would like to get access to all the fields in the...
For learning Angular 2, I am trying their tutorial. I am getting an error like this: (node:4796) UnhandledPromiseRejectionWarning: Unhandled promise rejection (r ejection id: 1): Error: spawn cmd ENOENT...
Suppose I have the following code. function divide(numerator, denominator) { return new Promise((resolve, reject) => { if(denominator === 0){ reject("Cannot divide by 0"); return; //superfluous? } resolve(numerator / denominator);...
How can I reject a promise that returned by an async/await function? e.g. Originally: foo(id: string): Promise<A> { return new Promise((resolve, reject) => { someAsyncPromise().then((value)=>resolve(200)).catch((err)=>reject(400)) }); } Translate into...
I have been using ES6 Promise. Ordinarily, a Promise is constructed and used like this new Promise(function(resolve, reject){ if (someCondition){ resolve(); } else { reject(); } }); But I...
Whether it’s an ES6 Promise or a bluebird Promise, Q Promise, etc. How do I test to see if a given object is a Promise? 19 Answers 19