I found this pouchdb blog post[1] really helpful when first trying to wrap my head around promise chaining patterns. Highly recommend!

[1]: https://pouchdb.com/2015/05/18/we-have-a-problem-with-promis...

This might sound bonkers at first, but I think I did not really understood promises until I implemented the spec myself (with a lot of studying others' code that is).

It's actually not too time-consuming (I think it took me an afternoon) and there is a test suite covering the entire spec on npm: https://www.npmjs.com/package/promises-aplus-tests so you can just hack away until everything is green.

Check out this guide: https://scotch.io/tutorials/javascript-promises-for-dummies

The pouchdb blog post linked is really good too!

Solid intro article. https://beta.observablehq.com/@mbostock/introduction-to-prom...

Thanks everybody, for answering.