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

[Jonathan Hull]

What about mapOrNil?


> On Nov 21, 2017, at 3:00 PM, Wallacy via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Let’s think I little. If the ideia is choose the best name to explain the function:
> 
> If the function drop the nil values and after that does a map operation. Names like dropNilAndMap make sense, right?
> 
> But we are talking about functions that mimics the berraviour of Functional programming languages, doesn’t apear the be “functional” drop nils and make a map in the same operation instead in two steps: dropNils().map{**}
> 
> I think we only need to make a function (or a property) to easily drop (remove or whatever name) and then feal free to call a map or other function on it. (Or call a map and drop the nils after, how knows)
> 
> The role problem is the operation by itself, is confusing because is too specific and the main use for this is the identity operation for just remove the optional level.
> 
> Array.ToNonOptional()
> Array.DropNil()
> Array.WithNonOptional()
> Etc...
> 
> If we only focus in this functionality, the ‘map’ part is already solved.
> 
> 
> Em ter, 21 de nov de 2017 às 08:47, Benjamin G via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> escreveu:
> I have a question regarding the general term "compact" vs something more specific like "remove nil" : 
> Could we imagine other usages on different types for "compact" ?
> 
> map / flatmap has the whole category theory behind it, making it meaningful for many different types. "Filter" is also generic, because the operation of filtering has a wide range of application. 
> 
> "Compact", like Tino suggested, would have the general meaning of "reducing the size by removing similar elements". Removing nils doesn't seem to be a special case of this general definition. 
> 
> If we give "compact" the strict definition of "removing nil", then i don't understand the need for a general term, instead of something like "dropNils" (not much longer to write).
> 
> 
> On Tue, Nov 21, 2017 at 10:47 AM, Tino Heth via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> My favorite would be a variation of Scalas choice (collect / collectResults).
> The word compact (or similar choices like condense, squeeze, pack, compress…) always remind me on compression — my first association of „compact“ would be a transform that turns [1, 2, 2, 3] into [1, 2, 3] (like the shell tool uniq).
> But there’s a long list of verbs with similar meaning, so if there’s a consensus for compact (or compacted…), I join that camp.
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