Let's work with doOn in code. We will use the same playground page, and start by commenting out the implementation so far. We will create a bare-bones implementation of the method for doOn and inside the implementation we will declare a disposeBag, as follows:
executeProcedure(for: "do(on....:)") { let disposeBag = DisposeBag() }
Then, we will create a PublishSubject of the Int type:
let temperatureInFahrenheit = PublishSubject<Int>()
This PublishSubject will hold values that are temperatureInFahrenheit that we want to convert to Celsius.
We will chain a do(onNext:) operator on to the sequence and in it, multiply the element by itself. Although we could work with the result of this calculation within the do(onNext:) handler, ...
