[swift-evolution] [Accepted and Focused Re-review] SE-0187: Introduce Sequence.filterMap(_:)

Anders Ha anders at andersha.com
Thu Nov 16 02:12:55 CST 2017

It does not use `Optional`, but it is semantically equivalent to `filterMap` in CwlSignal and ReactiveSwift, and the `filterMap` proposed for `Sequence` (but in the time domain instead).


> On 16 Nov 2017, at 2:07 PM, Gwendal Roué via swift-evolution <swift-evolution at swift.org> wrote:
>> Le 16 nov. 2017 à 06:29, Matt Gallagher via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> a écrit :
>> My opinion is that filterMap is the right choice of name.
>> I'm completely biased, given that I already have a Swift library that uses filterMap, in exactly this context, for a Reactive Programming library:
>> 	https://github.com/mattgallagher/CwlSignal/blob/22f1d47895896d7b55bc59a4ee5394071f3c84cf/Sources/CwlSignal/CwlSignalReactive.swift#L453?ts=3 <https://github.com/mattgallagher/CwlSignal/blob/22f1d47895896d7b55bc59a4ee5394071f3c84cf/Sources/CwlSignal/CwlSignalReactive.swift#L453?ts=3>
> Another popular Reactive Programming Library uses filterMap with a different signature, and a different meaning: https://github.com/RxSwiftCommunity/RxSwiftExt/blob/3.0.0/Source/RxSwift/filterMap.swift#L32 <https://github.com/RxSwiftCommunity/RxSwiftExt/blob/3.0.0/Source/RxSwift/filterMap.swift#L32>
> There are already different interpretations on "filter" in "filterMap" in the wild.
> Gwendal Roué
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