The fetch() API is a web standard. You can find the official documentation at the following link: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API. The fetch() API is Promise-based, which means we need to convert it to an Observable before use. The API exposes a fetch() method, which takes a mandatory URL parameter as the first argument, with the second argument being an optional object that allows you to control which body to send, if any, which HTTP verb to use, and so on.
We have already mentioned how to best deal with it in the context of RxJS. It is worth repeating though. It is not as simple as just taking our fetch and sticking it into the from() operator though. Let's write some code and see why:
let convertedStream$ ...
