How then works in your example. Welcome to the wonderful world of promises.
Bluebird is a fully featured JavaScript promises library with unmatched performance. To use Bluebird from within a Node application, the Bluebird module is required. You can require the library and pass it into Promise.promisifyAll to quickly integrate it into your project. .then ((rows) => { Consider using @types/bluebird-global as follows. Just set mongoose.Promise to your favorite ES6-style promise … Bluebird is a fully-featured Promise library for JavaScript. Bluebird provides promisify which transforms any function callback with the signature of function(err, data) into a Promise. It provides a great abstraction layer over promises, and useful methods to transition your callback-based code. You can see that here. Node.js 8.17.0.
typeCloser = func.concatRight (row.cli_people_type, 1, ''); Welcome to the wonderful world of promises. Some express surprise over not using native Promises, at times citing concerns that third party Promise libraries might not be as performant as Native Promises but, IMHO, this is a poor metric as: a) Promises are mostly used in conjunction with external resources (DB or API queries) — the bottleneck isn’t the Promise implementation; b) third party Promise implementations are leaner and more performant than Native Promises — at least for now. If value is a promise, the delay will start counting down when it is fulfilled and the returned promise will be fulfilled with the fulfillment value of the value promise. Promise.promisify takes a function that takes a callback as its last argument and converts it into a function that returns a promise (without the need for a callback). Isolated, full-stack environments for every branch. Some of these are taken directly from our codebase in order to help out anyone looking to start migrating to promises or just improve and clean up your current implementations. Promise.all (or just returning an array from a then fulfillment handler and then using .spread) is used for waiting for multiple results to all complete. GraphQL is an application layer server-side technology which is developed by... A module in Node.js is a logical encapsulation of code in a single unit. }) This method can also be use to quickly migrate your old callback-based code into promises. other SeqCMP = seqCLI; Most times, promisifying functions will get you close enough to being able to use promises, but not every time. .catch ((error) => {console.log (error), db.close ()}); promise.using (db, () => { We use cookies and similar technologies ("cookies") to provide and secure our websites, as well as to analyze the usage of our websites, in order to offer you a great user experience. Learn more. Promise 구현체인 Bluebird에 대한 발표 자료입니다. In our code base we use Promise.method to declare functions which we want to always return a promise. if (seqCLI == seqCMP) {seqCLI + = +1} Last but not least is Bluebird’s wrapper to node type callback function interfaces. This method provides a callback you can pass to any other function and it will return a promise. When also provides an equally robust API. 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. querying a database would block execution in Ruby until the query completes. The effect is similar to wrapping your function around a Promise.try. Promises are also present in other programming languages: Futures in Dart; concurrent.futures in Python and so on. Hello, I have two promise as functions and also other functions using bluebird, how do I now to chain the execution of promises and functions?
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