groupBy() is another RxJS operator to create higher order observables. In this lesson we will learn how groupBy works for routing source values into different groups according to a calculated key.

const numbersObservable = Rx.Observable.interval(500).take(5);

numbersObservable
.groupBy(x => x % 2)
.map(innerObs => innerObs.count())
.mergeAll()
.subscribe(x => console.log(x)); /*
--0--1--2--3--4| groupBy(x => x % 2) --+--+---------|
\ \
\ 1-----3---|
0-----2-----4| map(innerObs => innerObs.count()) --+--+---------|
\ \
\ ---------2|
------------3| mergeAll --------------(3,2)| */

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