es6-promise Archives

javascript, Programming

IT Nursery

JavaScript ES6 promise for loop

for (let i = 0; i < 10; i++) { const promise = new Promise((resolve, reject) => { const timeout = Math.random() * ...

June 3, 2022
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javascript, Programming

IT Nursery

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 ...

May 30, 2022
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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 ...

May 21, 2022
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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 ...

May 20, 2022
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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 ...

May 19, 2022
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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 ...

May 18, 2022
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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"); ...

May 11, 2022
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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) => ...

May 7, 2022
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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 ...

May 7, 2022
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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 ...

May 5, 2022
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