promise Archives - IT Nursery

angularjs, Programming

IT Nursery

How to cancel an $http request in AngularJS?

Given a Ajax request in AngularJS $http.get("/backend/").success(callback); what is the most effective way to cancel that request if another request is launched (same ...

June 2, 2022
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javascript, Programming

IT Nursery

How do I wait for a promise to finish before returning the variable of a function?

I’m still struggling with promises, but making some progress thanks to the community here. I have a simple JS function which queries a ...

June 2, 2022
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javascript, Programming

IT Nursery

Why does .json() return a promise?

I’ve been messing around with the fetch() api recently, and noticed something which was a bit quirky. let url = "http://jsonplaceholder.typicode.com/posts/6"; let iterator ...

June 2, 2022
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javascript, Programming

IT Nursery

Return from a promise then()

I have got a javascript code like this: function justTesting() { promise.then(function(output) { return output + 1; }); } var test = justTesting(); ...

June 2, 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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node.js, Programming

IT Nursery

How to find which promises are unhandled in Node.js UnhandledPromiseRejectionWarning?

Node.js from version 7 has async/await syntactic sugar for handling promises and now in my code the following warning comes up quite often: ...

May 28, 2022
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javascript, Programming

IT Nursery

Why is my asynchronous function returning Promise { } instead of a value?

My code: let AuthUser = data => { return google.login(data.username, data.password).then(token => { return token } ) } And when i try to ...

May 28, 2022
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javascript, Programming

IT Nursery

How do I promisify native XHR?

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers ...

May 27, 2022
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javascript, Programming

IT Nursery

When is .then(success, fail) considered an antipattern for promises?

I had a look at the bluebird promise FAQ, in which it mentions that .then(success, fail) is an antipattern. I don’t quite understand ...

May 27, 2022
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javascript, Programming

IT Nursery

Difference between microtask and macrotask within an event loop context

I’ve just finished reading the Promises/A+ specification and stumbled upon the terms microtask and macrotask: see http://promisesaplus.com/#notes I’ve never heard of these terms ...

May 26, 2022
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