Introduced in ES6, a is an object representing the eventual success or failure of an async operation. JavaScript Callbacks, Promises, and Async / Await Explained
The original way to handle async tasks involves passing a function (the "callback") into another function to be executed once a task finishes. : Functions are nested inside one another. Callbacks vs Promises vs Async/Await difference...
: Leads to "Callback Hell" (deeply nested, unreadable code) and makes error handling difficult as you must check for errors at every level. 2. Promises Introduced in ES6, a is an object representing
: Simple for very basic, one-off tasks; works in older environments. Introduced in ES6