Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/toPromise.ts Let's take a look. Cool! Netanel Basal. [00:05:27] There is an attempt by myself and a few others to get observable into JavaScript language. It seems to be a core part of JavaScript. The previous examples were simply to prove a point: Operators receive the original Observable return an Observable. ... Checkout the MDN docs for a deeper understanding of call and its cousin apply. It is also optimal, because .every() method breaks iterating after finding the first odd number.. 8. You create the