Reactive Programming and observables are really powerful and go beyond what promises offer. They provide key features like laziness and the ability to cancel them. This allows you to add robustness into Angular 2 applications especially at the level of HTTP to finely control what is executed.
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At the end of 2015, the AngularJS community announced the beta of Angular 2. The REST API development community followed the changes closely. Angular is one of the most popular frameworks for API developers to add a front-end to an API.