JavaScript ES6 promise for loop
for (let i = 0; i < 10; i++) { const promise = new Promise((resolve, reject) => { const timeout = Math.random() * … Read more
es6-promise
How can I synchronously determine a JavaScript Promise’s state?
I have a pure JavaScript Promise (built-in implementation or poly-fill): var promise = new Promise(function (resolve, reject) { /* … */ }); From … Read more
Is Node.js native Promise.all processing in parallel or sequentially?
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 … Read more
Promise.all: Order of resolved values
Looking at MDN it looks like the values passed to the then() callback of Promise.all contains the values in the order of the … Read more
Axios get access to response header fields
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 … Read more
What is an unhandled promise rejection?
For learning Angular 2, I am trying their tutorial. I am getting an error like this: (node:4796) UnhandledPromiseRejectionWarning: Unhandled promise rejection (r ejection … Read more
Do I need to return after early resolve/reject?
Suppose I have the following code. function divide(numerator, denominator) { return new Promise((resolve, reject) => { if(denominator === 0){ reject(“Cannot divide by 0”); … Read more
How to reject in async/await syntax?
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) => … Read more
Resolve Javascript Promise outside the Promise constructor scope
I have been using ES6 Promise. Ordinarily, a Promise is constructed and used like this new Promise(function(resolve, reject){ if (someCondition){ resolve(); } else … Read more
How do I tell if an object is a Promise?
Whether it’s an ES6 Promise or a bluebird Promise, Q Promise, etc. How do I test to see if a given object is … Read more