[swift-evolution] [swift-evolution-announce] [Accepted with revisions] SE-0187 “Introduce Sequence.filterMap(_:)”

Erica Sadun erica at ericasadun.com
Thu Dec 21 22:49:25 CST 2017

> On Dec 19, 2017, at 4:42 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
>> On Dec 19, 2017, at 2:28 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> I disagree. Let’s not reopen what is settled. “Compact” can be a noun just as “map” and “filter” can; as long as there are no in-place variants, there can be no ambiguity.
>> On Tue, Dec 19, 2017 at 17:11 Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> On Dec 19, 2017, at 8:56 AM, John McCall <rjmccall at apple.com <mailto:rjmccall at apple.com>> wrote:
>>> Therefore, SE-0187 is accepted, with the revision that the new name be Sequence.compactMap(_:), and with the agreement that we will add Sequence.compact() when it is possible to do so.
>> I like `compact` as the basis for the name, but I hope the core team will consider whether the eventual nil-removal method should be called `compacting()`, and whether therefore this method should be called `compactingMap(_:)`. Prior art on the name `compact()` does exist, but I don't think it's strong enough to justify deviating from the API Guidelines.
>> I don't think we need a full review on this tiny issue; five minutes of the core team's time should more than suffice.
> I agree with Brent. IMO we're firmly outside the domain of established terms-of-art here (Ruby notwithstanding). 

I lean slightly towards "but they already have been through this", but given that the core term is "compact" and it is secondary to map, then I think `mapCompacting` is superior: 

* It mirrors the process better (apply function, then decide whether to include or exclude the result)
* It prefers `compacting` as Brent points out, supporting the Swift API Guidelines
* It uses the term of art `map` consistently with this preferred term.
* It places the two names closer together in autocomplete

-- E, hiding the bikeshed paintbrush behind her back
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