We have seen how Subjects are useful for sharing an execution of an RxJS observable to multiple observers. However, this technique requires some laborious setting up. In this lesson we will learn about the multicast() operator which helps solve the s…

rxjs自定义operator…

RxJS is a lot about the so-called "operators". We will learn most of the important operators, one by one. In this lesson, we will see our first creation operator: of(). var foo = Rx.Observable.of(42, 100, 200); // var bar = Rx.Observable.create(…

Operator repeat() is somewhat similar to retry(), but is not for handling operators. In this lesson we learn how repeat works. var foo = Rx.Observable.interval(500) .zip(Rx.Observable.of('a','b','c','d'), (x,y)=>y); var bar = foo.map(x => x.toUpperC…

This lesson will teach you about another horizontal combination operator: buffer and its variants. Buffer groups consecutive values together, emitting the output as an array. The buffer variants and their arguments allow to specify when to close the…

All of the combination operators take two or more observables as input. These operators may also be alternatively called "vertical combination operators", because of how they work in a marble diagram. Next, we will learn about scan(), which is a…

Operator combineLatest is not the only AND-style combinator. In this lesson we will explore withLatestFrom, another AND-style combination operator, and how it works essentially as map() operator, with some combination properties. var foo = Rx.Observa…

While merge is an OR-style combination operator, combineLatest is an AND-style combination operator. This lesson explains what AND-style combination means, and how you can join values from two or more Observables in a formula. At the begin, there is…

This lesson introduces filter: an operator that allows us to let only certain events pass, while ignoring others. var foo = Rx.Observable.interval(1000); /* --0--1--2--3--4--5--6--7- filter(x => x % 2 === 0) --0-----2-----4-----6---- */ var bar = foo…

We just saw map which is a transformation operator. There are a couple of categories of operators, such as filtering, combination, flattening, etc. One of these categories is the utility operators. The most important utility operator is do, useful fo…