[swift-evolution] [Review] SE-0187: Introduce Sequence.filterMap(_:)

[BJ Homer]

> On Nov 10, 2017, at 5:07 AM, Tino Heth <2th at gmx.de> wrote:
> 
> A: Well, it does a mapping, and then applies a filter to get rid of nils,

I prefer to think of it this way: it does a mapping, and keeps the results where the closure did not return nil. In the example given earlier, the closure returned Optional<Int?>.some(nil), which is not “nil”.

-BJ