RxSwift: WithLatestFrom Operator

.withLatestFrom()

• Combines the emission of multiple Observables via a supplied function by combining each element from self with the latest element from the second source.
• When self emits an element, it will combine with the latest from the second Observable.
• If self emits and the second Observable does not have a value yet, nothing will emit.
• Useful for user interfaces. Say, tap plus the latest value in a UITextField.
• Similar to the sample operator only, with withLatestFrom takes data as a parameter.

---1---------2------3-------4----------5-------->
------a-b-------c-d-----e-f----g----h-------i--->

withLatestFrom

-------------2b-----3d-----4f---------5h-------->

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