RxJava 2，flatmap 的 resultSelector 参数会发生什么? [英] RxJava 2, what happen the resultSelector argument of flatmap?

问题描述

在 RxJava1 flatmap 中有一个重载方法，允许您保留源值并将其传递到流中.

In RxJava1 flatmap had a overloaded method that allowed you to retain source values and pass it down the stream.

我从以下博文中获得了这些知识

I've gained this knowledge from the following blog post

https://medium.com/rxjava-tidbits/rxjava-tidbits-1-use-flatmap-and-retain-original-source-value-4ec6a2de52d4

然而，转向 RxJava2，我似乎找不到它.我检查了 Rx1 和 Rx2 的更改，但未列出.我想知道它是否仍然存在，但我可能没有找对地方.

However, moving to RxJava2, I cannot seem to find it. I checked the changes from Rx1 and Rx2 and it is not listed. I would like to know if it exists still but I am perhaps not looking in the right place.

顺便说一下，我使用的是 Single.

I am using a Single by the way.

推荐答案

我不认为 Single 曾经支持过这个操作符和 Observable/Flowable 运算符仍然存在.您可以通过映射内部源的结果来完成此行为:

I don't think Single ever supported this operator and the Observable/Flowable operators are still there. You can accomplish this behavior by mapping the result of the inner source:

source.flatMap(originalValue -> 
    createInnerSource(originalValue)
    .map(innerValue -> process(originalValue, innerValue))
)

map 的 lambda 将为您捕获 originalValue.

The lambda of the map will capture the originalValue for you.

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