This is a JavaScript promises tutorial - ECMASCRIPT6 - for beginners and developers alike. The examples are interactive and easy to understand. You can see the promises at work in the linked website. The topics covered are:

1. A general promise
2. Promise chaining
3. Promise.all()
4. Promise.race()
5. Generating the famous Fibonacci Sequence with promise chaining

This is the promises at work - https://www.vivaxsolutions.com/web/js-promises.aspx