Rxjs testing - is it possible to use marble diagrams also in RxJs 4?

问题

I have a simple question. RxJS v5 uses marble diagrams for its testing (example here). Is it possible to use the same technique in RxJS v4 and if so, how to ?

回答1:

You can always roll your own: here's a simple function to convert a string to a cold observable that emits string values:

// string -> Observable<string>
function fromMarble(s) {
    const items = s.split('-')
        .filter(x => x);

    return Rx.Observable.from(items);
}

fromMarble('--1--2--cheese--4--5').subscribe(x => console.log(x));
// >> 1
// >> 2
// >> cheese
// >> 4
// >> 5

来源：https://stackoverflow.com/questions/35762776/rxjs-testing-is-it-possible-to-use-marble-diagrams-also-in-rxjs-4