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es6-promise

Handling errors in Promise.all

by IT Nursery

Promise.all is all or nothing. It resolves once all promises in the array resolve, or reject as soon as one of them rejects. … Read more

Tags es6-promise, javascript

How to check if an object is a Promise?

by IT Nursery

How a promise library decides If it has a .then function – that’s the only standard promise libraries use. The Promises/A+ specification has … Read more

Tags bluebird, es6-promise, javascript, promise, q

JavaScript ES6 promise for loop

by IT Nursery

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

Tags es6-promise, javascript

How can I synchronously determine a JavaScript Promise’s state?

by IT Nursery

I have a pure JavaScript Promise (built-in implementation or poly-fill): var promise = new Promise(function (resolve, reject) { /* … */ }); From … Read more

Tags es6-promise, javascript, promise

Is Node.js native Promise.all processing in parallel or sequentially?

by IT Nursery

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

Tags es6-promise, javascript, node.js, promise

Promise.all: Order of resolved values

by IT Nursery

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

Tags es6-promise, javascript, promise

Axios get access to response header fields

by IT Nursery

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

Tags axios, es6-promise, http-headers

What is an unhandled promise rejection?

by IT Nursery

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

Tags angular, es6-promise, javascript, spawn, unhandled-exception

Do I need to return after early resolve/reject?

by IT Nursery

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

Tags es6-promise, javascript, promise

How to reject in async/await syntax?

by IT Nursery

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

Tags asynchronous, ecmascript-2017, es6-promise, typescript
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