Http data fetching with Observables

[kevinhendra]

how to use observables and HTTPClient in your module number 25 thanks but can't use Http

[xtingray]

To whom it may concern:

I made an update to all the examples of this repository to make them compatible with NodeJS LTS v18.12.0, in case you are interested in using them to study: https://github.com/xtingray/angular-fundamentals-src

In a few examples, I had to make significant changes as several resources have been deprecated (i.e., toPromise), anyway, I think they could be helpful for the new developers wanting to test usable code.

PS: In case you consider that some of the example code can be optimized, please let me know. Regards.