Rxjs:Observable.combineLatest 与 Observable.forkJoin [英] Rxjs: Observable.combineLatest vs Observable.forkJoin

问题描述

我想知道 Observable.combineLatest 和 Observable.forkJoin 之间有什么区别?

I'm wondering what are the differences between Observable.combineLatest and Observable.forkJoin?

据我所知，唯一的区别是 forkJoin 期望 Observables 完成，而 combineLatest 返回最新值.

As far as I can see, the only difference is forkJoin expects the Observables to be completed, while combineLatest returns the latest values.

推荐答案

forkJoin 不仅要求完成所有输入的 observable，而且还返回一个 observable，它产生一个单一的值输入 observables 产生的最后一个值的数组.换句话说，它等待最后一个输入 observable 完成，然后产生一个值并完成.

Not only does forkJoin require all input observables to be completed, but it also returns an observable that produces a single value that is an array of the last values produced by the input observables. In other words, it waits until the last input observable completes, and then produces a single value and completes.

相比之下，combineLatest 返回一个 Observable，一旦所有输入 observable 至少产生一个值，它就会在每次输入 observable 执行时产生一个新值.这意味着它可能具有无限值并且可能不完整.这也意味着输入 observable 不必在生成值之前完成.

In contrast, combineLatest returns an Observable that produces a new value every time the input observables do, once all input observables have produced at least one value. This means it could have infinite values and may not complete. It also means that the input observables don't have to complete before producing a value.

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