Observables are the "2.0" of Promises in handling async activity in JavaScript.  With that said, Promises can still be good if you are using libraries that work with promises.

Also promises are easier to understand and (at this point) higher chance developers have experience using Promise over Observable.

You can also use a Promise natively with JavaScript whereas Observables still require importing the RxJS library or similar implementations.

Of course this article does a great job of showing you how to create an observable from scratch.  This also shows you how relatively simple the concept is underneath the hood.

The Promise is still relevant and great for async operations where you are only concerned with the result of one async operation.  While the observable handles this well with Angular, it's still perfectly reasonable to use the Promise library for http requests, etc.

stackchief

Quickly understand JavaScript observables.  Implement the Observable class from scratch and understand what makes observables different from promises.

thejavascripttester

JavaScript Observables in 5 Minutes

thejavascripttester

JavaScript Observables in 5 Minutes

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