promise Archives - Page 3 of 4

Resolve promises one after another (i.e. in sequence)?

Consider the following code that reads an array of files in a serial/sequential manner. readFiles returns a promise, which is resolved only once ...

May 10, 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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What is std::promise?

I’m fairly familiar with C++11’s std::thread, std::async and std::future components (e.g. see this answer), which are straight-forward. However, I cannot quite grasp what ...

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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Aren’t promises just callbacks?

I’ve been developing JavaScript for a few years and I don’t understand the fuss about promises at all. It seems like all I ...

May 4, 2022
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jQuery deferreds and promises – .then() vs .done()

I’ve been reading about jQuery deferreds and promises and I can’t see the difference between using .then() & .done() for successful callbacks. I ...

May 3, 2022
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Wait until all promises complete even if some rejected

Let’s say I have a set of Promises that are making network requests, of which one will fail: // http://does-not-exist will throw a ...

May 2, 2022
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JavaScript Promises – reject vs. throw

I have read several articles on this subject, but it is still not clear to me if there is a difference between Promise.reject ...

May 1, 2022
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What is the explicit promise construction antipattern and how do I avoid it?

I was writing code that does something that looks like: function getStuffDone(param) { | function getStuffDone(param) { var d = Q.defer(); /* or ...

April 30, 2022
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How do I access previous promise results in a .then() chain?

I have restructured my code to promises, and built a wonderful long flat promise chain, consisting of multiple .then() callbacks. In the end ...

April 25, 2022
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