If, like me, you think using Promise.resolve() to cast/coerce a Bluebird promise seems like it both defeats the stated purpose of Bluebird (“Zero overhead abstraction”, “Runs everywhere”, “Spec compatible”, ...) and brings TypeScript to a cumbersome tipping point, consider using @types/bluebird-global as follows:. For Node.js, the framework available for Testing is...In this tutorial, we are going to learn about Generators and their differences with Callbacks What...What is Node.js?
If you're an advanced user, you may want to plug in your own promise library like bluebird. Until then, I use Bluebird to promisify whole libraries. If you are using Bluebird for performance rather than for those - please consider giving native promises a shot and running the benchmarks yourself. Stack Overflow works best with JavaScript enabled Questions and issues The strongest feature of Bluebird is that it allows you to "promisify" other Node modules in order to use them asynchronously. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesnative promises have very very basic features.
It will still not have all the useful features that Bluebird does and I'd be extremely surprised if it lives up to Bluebird's performance so there is still room for Bluebird alongside a future jQuery in some cases. 이후 여러차례 _promise.then(alert) 를 호출해도 이미 한번 수행이 되었기 때문에 계속해서 resolve 혹은 reject 가 수행될 것이다.
Free 30 Day Trial Generating promises with the BlueBird … In any case, the OP's question appears to be mostly about node.js. @JaromandaX - Please consider reopening now that the title and question have been tweaked to be more about why one would use a promise library rather than whether one "needs" to use a promise library. If "then" connection is established, then it will get all of the records in the collection and display them in the console accordingly. For example, I want to make a request for each name for each day of the week. But, that's still in beta. 2016年06月15日 18436 声明 To use Bluebird from within a Node application, the Bluebird module is required. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under You might as well get a utility that does this work for you. Stack Overflow for Teams is a private, secure spot for you and Promisify is a concept applied to callback functions. So, it feels like promises are about 20% implemented in node.js now since none of the built-in modules let you use promises with them without manually wrapping them first.Here's an example of plain Promises vs. Bluebird's promisify and Here's an example of plain Promises vs. Bluebird's promisify and This needs to get sorted out in node.js. 한번 테스트 삼아서 _promise.then(alert).catch(alert); 를 여러차례 수행해보자. I have nominated for reopening. This question can be answered by primarily supplying facts, not opinion. Also worth noting that Bluebird's promises appear to be significantly faster than the promises built into V8. It uses a...Download PDF 1) What is node.js? Bluebird not only provides solid performance, but it also provides wonderful abstractions over promises.In this article, I‘ll show you some of the more useful methods in Bluebird and how we use these here at Runnable. If it lives up to the promise (pun intended), it may obviate some of the reason to use an external promise library in browser JS if you were already using jQuery.
We will look at an example of how to use the bluebird module. See the answer below as a demonstration of that. If you're also using jQuery, you can sometimes just use the promise support built into jQuery (though it is painfully non-standard in some ways, perhaps fixed in jQuery 3.0), but if the project involves any signficant async activity, I find the extended features in Bluebird very useful. your coworkers to find and share information. Syntaxnew Cypress.Promise(fn) Usage Correct Usage new Cypress.Promise((resolve, reject) @thefourtheye - Yes, I know they've been working towards Promise/A+ compatibility in 3.0.