I want to retrieve a list of names, then make a number of POST requests for each name. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under But, that's still in beta.

your coworkers to find and share information. I have nominated for reopening. If "then" connection is established, then it will get all of the records in the collection and display them in the console accordingly.

This needs to get sorted out in node.js. See the answer below as a demonstration of that. 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:. In my opinion, this question can be answered by supplying facts and not primarily opinion - see answer below as a demonstration of that.This question after the title edit, and its accepted answer, are not opinion-based.Agreed. bluebird与原生Promise对象及bluebird模块的中文API文档.
For most other cases, nesting one level works fine. 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

It uses a...Download PDF 1) What is 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. See What would make me consider using Bluebird less in node.js development would be if node.js built in a promisify function so you could do something like this:Or just offer already promisified methods as part of the built-in modules.It seems a bit odd to have ES6 promise support built into node.js and have none of the built-in modules return promises. What is GraphQL? 2016年06月15日 18436 声明 This question can be answered by primarily supplying facts, not opinion. Instantiate a new bluebird promise.

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. To use a third-party promise library, set a promises dependency on the SDK by calling the setPromisesDependency method of the global configuration object. These optional promise libraries can be useful if you need your code to run in environments that don't support the native promise implementation in ECMAScript 5 and ECMAScript 2015. Cypress automatically includes Bluebird and exposes it as Cypress.Promise. For example, I want to make a request for each name for each day of the week. They have a .then() function for co and async/await as a convenience.

Questions and issues

For exceptions (unexpected conditions), you can already throw to terminate the chain early. If you're an advanced user, you may want to plug in your own promise library like bluebird. Bluebird still includes a lot of features like cancellation, iteration methods and warnings that native promises don't.

After Node.js added native support for promises, are there still reasons to use libraries like Q or BlueBird?

Node.js is a server-side platform built on Google Chrome's JavaScript Engine. npm install --save-dev @types/bluebird-global 즉각 실행되므로 _promise.then(alert) 등의 형태로 사용할 수 있다.
For example if you are starting a new project and let's assume in this project you don't have any dependencies that use these libraries, can we say that there are really no more reasons to use such libraries?The old adage goes that you should pick the right tool for the job. If you are using Bluebird for performance rather than for those - please consider giving native promises a shot and running the benchmarks yourself. To install the Bluebird module, run the below command If the above steps are carried out properly, all of the documents in the Employee collection will be displayed in the console as shown in the output below. Syntaxnew Cypress.Promise(fn) Usage Correct Usage new Cypress.Promise((resolve, reject) Featured on Meta

In any case, the OP's question appears to be mostly about node.js. 한번 테스트 삼아서 _promise.then(alert).catch(alert); 를 여러차례 수행해보자. So if a Node JS module contains a callback function which does not return a value, and if we Promisify the node module, all the function's in that specific node module would automatically be modified to ensure that it returns a value. And, I'd argue that ES6 promises are even missing some of the basics like promisification that are useful in pretty much every node.js project.In any node.js project, I immediately use Bluebird everywhere because I use Node.js does not itself provide a promise interface to the built-in modules that do async IO like the The alternative would be to manually create your own promise wrapper for each And, you have to manually do this for each API function you want to use.

Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesnative promises have very very basic features. ES6 promises provide the basics.

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