Promises

The video introduces promises in JavaScript, explaining their role in managing asynchronous code and how they improve upon the callback pattern. It covers the syntax of promises, their advantages, and the semantics of resolve and reject. The video also discusses promise states like pending, fulfilled, and rejected, and compares them to callbacks, highlighting clearer semantics and error handling. The tutorial concludes with a promise example and a preview of using promises with MongoDB.

What is the significance of the order of arguments in the callback pattern?

In what scenarios would you prefer to use promises instead of callbacks?

How can you ensure that a promise is not resolved or rejected multiple times?

What does it mean for a promise to be in a 'pending' state?