9c51ba321e
There is a slight difference between `map`...`concatAll` and `concatMap` in that the latter (`concatMap`) will ensure that the computations are executed in-order and only if needed while the former may execute the `map` body of all items if they do not emit immediately. That is, if the stream is `from([a, b, c]).pipe(map(v => of(v).pipe(delay(1))), concatAll(), first())` the `map` body will execute for all of `a`, `b`, and `c`. However, the following will only execute the `concatMap` body for `a` `from([a, b, c]).pipe(concatMap(v => of(v).pipe(delay(1))), first())` See https://stackblitz.com/edit/rxjs-cvwxyx fixes #38691 PR Close #38780
Angular Router
Managing state transitions is one of the hardest parts of building applications. This is especially true on the web, where you also need to ensure that the state is reflected in the URL. In addition, we often want to split applications into multiple bundles and load them on demand. Doing this transparently isn’t trivial.
The Angular router is designed to solve these problems. Using the router, you can declaratively specify application state, manage state transitions while taking care of the URL, and load components on demand.
Guide
Read the dev guide here.