Indeed...I had got it wrong too! We don't want someObj.map but Object.map ... and it is not supposed to be a problem!
On Fri, Mar 17, 2017 at 10:03 AM, T.J. Crowder < [email protected]> wrote: > > Indeed, Object.pick would be very promising, but it could indeed break > some codes! > > Adding to *`Object`* (the function) is fine (usually, a survey would be > needed). For instance, `Object.values` was added in ES2017. It's adding to > *`Object.prototype`* that's impossible. Important distinction. > > -- T.J. Crowder > > > > *Farsight Software Ltd | 20-22 Wenlock Road, London N1 7GU | Company > #8393428 [email protected] <[email protected]> > | Direct: +44 (0)20 3627 4231 <+44%2020%203627%204231> | Mobile: +44 > (0)7717 842 414 <+44%207717%20842414>* > If you've received this message in error, please let us know by forwarding > it to [email protected] and then delete it from your system. > Please don't copy it or disclose its contents to anyone. Separately, note > that email sent over the internet without a digital signature may be > modified en route. > > On Fri, Mar 17, 2017 at 12:53 PM, Felipe Nascimento de Moura < > [email protected]> wrote: > >> Well...this is a major problem, then! >> Indeed, Object.pick would be very promising, but it could indeed break >> some codes! >> >> On Fri, Mar 17, 2017 at 9:48 AM, Michał Wadas <[email protected]> >> wrote: >> >>> It's impossible to add new methods on Object.prototype because it would >>> be web-breaking - I have seen code that test for typeof arr.map === >>> 'function' >>> >>> On Set topic, I have written basic proposal for this >>> <https://github.com/Ginden/set-methods>, but it was ignored so I didn't >>> write formal spec. >>> >>> On 17/03/17 13:36, James Treworgy wrote: >>> >>> I think a good solution that doesn't require new syntax would be >>> map/filter methods on the Object prototype that return a new object, e.g. >>> >>> let subset = { a:1, b:2, c:3 }.filter(([key])=>['b'].includes(key)) >>> // subset = { b: 2 } >>> >>> let subset = { 1:1, b:2, c:3 }.map(([key, value])=>[key, value * 2]) >>> // subset = { a:2, b:4. c:6 } >>> >>> Actually I'd like this to be available on Map too. I've always thought >>> it was interesting that the Map and Set objects do not natively include >>> map/filter operations -- or maybe even most of the Array prototype methods >>> as applicable. And for Sets, basic set operations like >>> except/distinct/union. >>> >>> But a Javascript object is just a Map, really, or I guess one could say >>> that a Map is just an object with a few enhancements. It's surprising that >>> there is no native operation built in to directly convert between Maps and >>> objects given their conceptual similarity. In either case though it would >>> be nice to be able to apply standard processing rules that one applies to >>> Maps conceptually to an Object (and a Map) natively, like filter and map. >>> >>> >>> >>> On Fri, Mar 17, 2017 at 8:04 AM, Felipe Nascimento de Moura < >>> [email protected]> wrote: >>> >>>> Hi. >>>> Interesting to know that it has already been discussed. >>>> >>>> I know we could create a function to do similar things, but I think the >>>> language itself has evolved so well, this is a use case it could fit >>>> somehow. >>>> >>>> I think there could be different approaches for that, like >>>> >>>> Object.pick([ 'a', 'c' ], { a: 1, b: 2, c: 3 }) >>>> >>>> or >>>> >>>> let x = {a, c}{ a: 1, b: 2, c: 3 } >>>> >>>> or >>>> >>>> let {a, c} as x = { a: 1, b: 2, c: 3 } >>>> >>>> or >>>> >>>> >>>> let x = { a: 1, b: 2, c: 3 }{a, c} >>>> >>>> or >>>> >>>> let x = { a: 1, b: 2, c: 3 }['a', 'c'] >>>> >>>> Would you consider any of those as an interesting option? >>>> >>>> thanks. >>>> >>>> >>>> >>>> On Fri, Mar 17, 2017 at 7:25 AM, peter miller <[email protected] >>>> > wrote: >>>> >>>>> Hi, >>>>> >>>>> There seems to be little appetite for taking it up, in spite of it >>>>>> being >>>>>> (IMHO) a very common use case. >>>>>> >>>>> >>>>> I'll second it being common in my code. My personal highlights would >>>>> be assigning to this: >>>>> >>>>> ``` >>>>> this.{x,y,z} = a; >>>>> ``` >>>>> >>>>> and combining it with property spreading: >>>>> >>>>> ``` >>>>> const result = { a, b, ...x.{ y, z }, ...p.{ q, r } }; >>>>> ``` >>>>> >>>>> Peter >>>>> >>>>> -- >>>>> "There were drawings, and sheets of paper with writing on them, and it >>>>> seemed that they were the sustenance of life, that here were the warlocks, >>>>> almost the vehicles of destruction of man's life, but at the same time the >>>>> very reason for his living." --- Maeve Gilmore/Titus Awakes. >>>>> >>>>> _______________________________________________ >>>>> es-discuss mailing list >>>>> [email protected] >>>>> https://mail.mozilla.org/listinfo/es-discuss >>>>> >>>> >>>> >>>> >>>> -- >>>> [ ]s >>>> >>>> *--* >>>> >>>> *Felipe N. Moura* >>>> Web Developer, Google Developer Expert >>>> <https://developers.google.com/experts/people/felipe-moura>, Founder >>>> of BrazilJS <https://braziljs.org/> and Nasc <http://nasc.io/>. >>>> >>>> Website: http://felipenmoura.com / http://nasc.io/ >>>> Twitter: @felipenmoura <http://twitter.com/felipenmoura> >>>> Facebook: http://fb.com/felipenmoura >>>> LinkedIn: http://goo.gl/qGmq >>>> --------------------------------- >>>> *Changing the world* is the least I expect from myself! >>>> >>>> _______________________________________________ >>>> es-discuss mailing list >>>> [email protected] >>>> https://mail.mozilla.org/listinfo/es-discuss >>>> >>>> >>> >>> >>> _______________________________________________ >>> es-discuss mailing >>> [email protected]https://mail.mozilla.org/listinfo/es-discuss >>> >>> >>> >>> _______________________________________________ >>> es-discuss mailing list >>> [email protected] >>> https://mail.mozilla.org/listinfo/es-discuss >>> >>> >> >> >> -- >> [ ]s >> >> *--* >> >> *Felipe N. Moura* >> Web Developer, Google Developer Expert >> <https://developers.google.com/experts/people/felipe-moura>, Founder of >> BrazilJS <https://braziljs.org/> and Nasc <http://nasc.io/>. >> >> Website: http://felipenmoura.com / http://nasc.io/ >> Twitter: @felipenmoura <http://twitter.com/felipenmoura> >> Facebook: http://fb.com/felipenmoura >> LinkedIn: http://goo.gl/qGmq >> --------------------------------- >> *Changing the world* is the least I expect from myself! >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> >> > -- [ ]s *--* *Felipe N. Moura* Web Developer, Google Developer Expert <https://developers.google.com/experts/people/felipe-moura>, Founder of BrazilJS <https://braziljs.org/> and Nasc <http://nasc.io/>. Website: http://felipenmoura.com / http://nasc.io/ Twitter: @felipenmoura <http://twitter.com/felipenmoura> Facebook: http://fb.com/felipenmoura LinkedIn: http://goo.gl/qGmq --------------------------------- *Changing the world* is the least I expect from myself!
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