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

[Stephen Celis]

+1

> On Nov 7, 2017, at 6:23 PM, John McCall <rjmccall at apple.com> wrote:
> 
> 	• What is your evaluation of the proposal?

BJ summarized my thoughts nicely. I think “flatMap” in its current form is confusing to both newcomers and functional programmers familiar with the nomenclature. I’ve been aware of this disparity and thought about it for awhile. I typically redefine “flatMap” as “mapOptional” in my projects for clarity.

> 	• Is the problem being addressed significant enough to warrant a change to Swift?

I think so! It improves the user experience in a significant way to those that encounter the function in the wild.

> 	• Does this proposal fit well with the feel and direction of Swift?

Yes.

> 	• If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?

It fits in well. Swift’s current extra implementation of “flatMap” is the anomaly.

> 	• How much effort did you put into your review? A glance, a quick reading, or an in-depth study?

Gave a quick reading to the proposal.
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