Right, `map()` et al. plus arrow functions come pretty close to the syntactic elegance of comprehensions.
> On 15 Apr 2015, at 20:27, Mark S. Miller <erig...@google.com> wrote: > > Dave Herman did an excellent presentation at one of the TC39 meetings that > convinced us all to drop comprehension syntax from ES6. I remember it > surprised us all including, earlier Dave, which led to his presentation. > Anyone have a link? > > The arguments that I remember as most significant are > a) When you look as how much syntactic convenience comprehensions provide > above explicit calls to higher-order operations (assuming we have .map, > .filter, as well as the currently absent .flatMap) and arrow functions, the > answer is not much. > b) When your comprehensions involve only those ho operations, fine. But as > soon as you try to mix in some other ho operation, such as e.g., a reduce, if > you started with a comprehension you're gonna create a mess. OTOH, if you > were starting with code explicitly calling ho operations, then there's > nothing confusing or unnatural mixing in some others. > > IMO, #a was necessary to convince me. YAGNI. Given #a, #b was sufficient. > > Dave, if I've misrepresented you in any way, please correct. Thanks. > > > > > On Wed, Apr 15, 2015 at 10:20 AM, Axel Rauschmayer <a...@rauschma.de > <mailto:a...@rauschma.de>> wrote: > It’s important to keep in mind that there is no official version of array > comprehensions, at the moment. So that is something to keep in mind whenever > they are added to the language. > > I’d probably implement flatMap() and use it if I ever needed to do something > like this. > >> On 15 Apr 2015, at 18:34, Tab Atkins Jr. <jackalm...@gmail.com >> <mailto:jackalm...@gmail.com>> wrote: >> >> On Wed, Apr 15, 2015 at 9:31 AM, Jeremy Martin <jmar...@gmail.com >> <mailto:jmar...@gmail.com>> wrote: >>> Why not just `[...x, ...y]`? >> >> Obviously that's a solution to the trivial example that monolithed >> provided, but it's not a solution to the more general problem he's >> alluding to, where you're doing a comprehension and want to insert two >> or more elements into the result in a single iteration. >> >> ~TJ >> _______________________________________________ >> es-discuss mailing list >> es-discuss@mozilla.org <mailto:es-discuss@mozilla.org> >> https://mail.mozilla.org/listinfo/es-discuss >> <https://mail.mozilla.org/listinfo/es-discuss> > > -- > Dr. Axel Rauschmayer > a...@rauschma.de <mailto:a...@rauschma.de> > rauschma.de <http://rauschma.de/> > > > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org <mailto:es-discuss@mozilla.org> > https://mail.mozilla.org/listinfo/es-discuss > <https://mail.mozilla.org/listinfo/es-discuss> > > > > > -- > Cheers, > --MarkM -- Dr. Axel Rauschmayer a...@rauschma.de rauschma.de
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