RxSwift foundation part 2: Observables and Subjects

Reactive programming has been in the picture for more than 20 years now, but it did not really start to gain momentum until the introduction of reactive extensions in 2009. Reactive extensions or Rx are available for several languages, and they look and behave the same for the most part across all these languages. Development began on RxSwift in February 2015, and it became the official reactive extension for Swift in August the same year.

Rx offers a common set of operators, to perform various tasks based on events in an asynchronous…