RxReactive.md

Combine and get the latest value of each once each observable has a value:

https://www.learnrxjs.io/operators/combination/combinelatest.html

combineLatest(observable1...n, whatToDoWithThoseValues())

change the emitted value of an observable:

https://www.learnrxjs.io/operators/transformation/map.html

map( value -> whatToDoWithThatValueBeforeReturningIt() )