RxSwift: BindTo

• Special and tailored version of subscribe
• No side effects or special cases
• Bind user interface to underlying data and other things such as a certain observable triggering a subject to perform a background task.
• To bind an observer to another entity, the receiver must conform to observer type. i.e: a Subject that can process values but also written to.

result.map { "\($0.score)" }
      .bindTo(scoreLabel.rx.text)
      .addDisposableTo(disposeBag)

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