"JavaScript Promises: reason about async events, serially chain them, reduce them. General replacement for XHR"
What is a promise? Conceptually and outside the context of code, a promise is either a willful intention of achieving a result or a promise is considered the actual result itself. EcmaScript 6 (ES6) introduces the Promises API which is currently implemented by most browsers (and Edge but not IE according to caniuse.com - but there's a polyfill for that). So a JavaScript Promise is simply an object of some callback...