标签：out with routing learn tor pre count() work into
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)| */
[RxJS] Split an RxJS Observable into groups with groupBy
标签：out with routing learn tor pre count() work into
原文地址：http://www.cnblogs.com/Answer1215/p/6213448.html
