Play the long game when learning to code. Why does Stockfish recommend this bishop exchange early on? Why are Trump supporters flying the flag of East Turkistan? rev 2020.10.6.37736, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. step2() From an ATC perspective, what is an "arrival gate"? @smarx, @WeiRoR: Thanks for the hints, updated my answer. Bluebird is a fully featured JavaScript promises library with unmatched performance.
In general, something with a map is called a functor, the guarantees a map function must hold are basically only that Promise.resolve([1,2,3]).map(x => x) resolves to the same values, and that Promise.resolve([1,2,3]).map(f).map(g) is the same as Promise.resolve([1,2,3]).map(x => g(f(x))).. Does the main character have to be likable? @naartjie. What is the explicit promise construction antipattern and how do I avoid it? Read now. How do they get very young child actors to cooperate? Is there a language where there are personal pronouns for the first or second person that have gender? Your second approach was properly defining Promise to be Bluebird's library and that's why Promise.map() worked, but you were not using Bluebird's promises with mongoose which will work in some cases because of promise interoperability between different types of promises as long as you only use .then() on the promises that come back from mongoose and nothing special like the myriad of Bluebird … Here's a visual of the flow I'm trying to achieve. How do I convert an existing callback API to promises? What is this fallacy: “Expecting something to continue just because it has never stopped”. Logical conclusion: Use an array. Step 2) The next step is to include the bluebird module in your code and promisify the entire MongoDB module. Active 3 years, 4 months ago. Black Hole Collision & Gravitational Waves, How to make a curve behave like a squeezed tooth paste (to born from a moving object but to stay on ground). site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. How can I get the full object in Node.js's console.log(), rather than '[Object]'? I don't understand. And I am using to use Bluebird's API .map to make sure a redirect only happens after all the question.addAnswers(answer) promises are done. Asking for help, clarification, or responding to other answers. Should one - moreover can one - defrost a frozen product like this before cooking? Did I miss something? Why are all quarks and leptons of this universe the same? Stack Overflow for Teams is a private, secure spot for you and
rev 2020.10.6.37736, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Mechanically is there any difference between split and double faced cards? My lazy way of testing. Which astronauts or cosmonauts were injured by a hard landing? Then you warp the async function with callback with new Promise. Is there a way to safely tranquilize my cat, so he does not remember a vet visit? Goodbye, Prettify.
Thanks for contributing an answer to Stack Overflow! Why is it considered an accomplishment for a president to appoint a Supreme Court judge? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. step1() Therefore, in my terminal, I should see something like this: Therefore, I assume the Promise.map is not working at all.
Is there evidence that the Republican Party leadership wants/prefers fewer people to vote? Correctly and incorrectly mounting a bicycle. How can live fire exercises be made safer? What is this closed off pipe under my Kitchen sink? Which astronauts or cosmonauts were injured by a hard landing? Stack Overflow for Teams is a private, secure spot for you and
How do I return the response from an asynchronous call?
When bluebird converts a module (like xml2js) into a promise based API using promisifyAll then it appends an Async suffix to each function name and adds that function into that object: var module = Promise.promisifyAll(require('xml2js')); // example: xml2js … Why do I see a reflexive pronoun at the end of the sentence? I'm using a chain to control flow and can't get promise.map in step2() to wait until all of it's generated promises are resolved. The problem is from step 2. Why is there a space between the left parenthesis and the radical sign? How to access the correct `this` inside a callback? 20 Amp single receptacle on two 15 amp breakers? I can't. And it works! it's probably just because async call finished before the timeout so that you got the result from the async call, but it's not an good idea because you will never know which one finish first. How can I force my Mac to attempt to boot a version of macOS that's too old to run? I am trying to build associations between a question and answers. Why can so little digital information be stored on a cassette tape? Maybe you should use an array instead? By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. What am I doing wrong? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. When is .then(success, fail) considered an antipattern for promises? You should be doing. Asking for help, clarification, or responding to other answers. Is there evidence that the Republican Party leadership wants/prefers fewer people to vote? What to do? Viewed 9k times 2. Motorized speedboat from Technic Catamaran alternate model? You are not calling your resolve callback properly. I'm currently learning how to use promises in nodejs so my first challenge was to list files in a directory and then get the content of each with both steps using asynchronous functions. If you only want to return a value, there is not much benefit to using Promise.map() over forEach. Goodbye, Prettify. Play the long game when learning to code. I know that this code was working before but now can't get it so. your coworkers to find and share information. map function for objects (instead of arrays), Node.js quick file server (static files over HTTP). Break promise chain and call a function based on the step in the chain where it is broken (rejected). Why did God choose circumcision and Paul cancel it?
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