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4 Feb 2018 JavaScript is a single-threaded language, which means that it can only do . In JavaScript, we do have access to the promise constructor, so we can . Find the best tutorials and courses for the web, mobile, chatbot, AR/VR 18 Jan 2019 Node.js Promise Tutorial. In the above code, the part of the function(err,db) is known as the declaration of an anonymous or callback function. Promise (обычно их так и называют «промисы») – предоставляют удобный способ организации асинхронного кода. В современном JavaScript промисы For this example, we will make use of the most common async function in javascript : setTimeout , to create a 1 Dec 2016 Let's convert this to JavaScript. /_ ES5 _/ var isMomHappy = false; // Promise var willIGetNewPhone = new Promise( function (resolve, reject) { if fulfilled - The action relating to the promise succeeded an object that is promise-like, in that it has a then method. 26 Feb 2019 Note: This article describes the Promise constructor and the methods and properties of such objects. To learn about the way promises work and Understanding JavaScript Promises. A promise represents the eventual result of an asynchronous operation. It is a placeholder into which the successful resultImagine that you're a top singer, and fans ask day and night for your upcoming single. To get some relief, you promise to send it to them when it's published. 12 Oct 2018 Javascript Promise Example Tutorial. Javascript promise is a special JavaScript object that links the “producing code” and the “consuming