RxSwift: Zip Operator

.zip()

• Combines the emission of multiple Observables via a supplied function.
• Emits a single element for each combination based on the results of the supplied function.
• Function applied in strict order such that the first element emitted by the first Observable will be used with the first element emitted from the second Observable.
• It will only emit as many times as the fewest emitting Observable.
• Uses indexed sequencing.
• If one Observable completes, the output Observable completes.
• It does not wait until all the inner Observables are done.
• Multiple variants just like combineLatest - one variant for collections.

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

zip

------1a-----2b-----3c------4d---------5e------->

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