please add x .= f()

[Iago Sousa]

I vote for no. There is no performance gain and I can hardly see anyone
using it.
Em seg, 10 de ago de 2015 às 22:18, Isiah Meadows <isiahmeadows at gmail.com>
escreveu:

> That's not really the point.
>
> The suggestion is this instead:
>
> ```js
> if (s[0] === '/') s = s.slice(1);
> if (s[0] === '/') s .= slice(1);
> ```
>
> This already exists in CoffeeScript and most derivatives/dialects.
>
> ```coffee
> s .= slice 1 if s[0] is '/'
> ```
>
> Don't know of any other languages that have an equivalent, though.
>
> On Mon, Aug 10, 2015, 19:31 Jordan Harband <ljharb at gmail.com> wrote:
>
>> For that, you'd do `if (s.charAt(0) === '/') { s = s.slice(1); }` - which
>> is only slightly more verbose than your example, without the burden of new
>> syntax.
>>
>> On Mon, Aug 10, 2015 at 1:57 PM, Soni L. <fakedme+es at gmail.com> wrote:
>>
>>> Welp I keep replying this wrong (how should I configure my email client?)
>>> -------------------------------------------------------------------------
>>>
>>> It /could/ in theory be used like this:
>>>
>>> function path(s) {
>>>   if (s.charAt(0) == '/') { s.=substring(1); }
>>>   // your stuff here
>>> }
>>>
>>>
>>> On 10/08/15 04:50 PM, Andrea Giammarchi wrote:
>>>
>>> not only it's badly readable and reminds me the PHP string
>>> concatenation,
>>> but it promotes different type assignment which is a performance, and
>>> virtually strongly typed, anti-pattern.
>>>
>>> I think Brendan said already it all, the proposal is badly described,
>>> and it solve pretty much nothing in the real world.
>>>
>>> Probably we can just move on and ignore the list of -1 we'll all put in?
>>> ;-)
>>>
>>> Best Regards
>>>
>>> On Mon, Aug 10, 2015 at 8:46 PM, <myemailum14 at gmail.com> wrote:
>>>
>>>> Please no, while i can see how logically it's derived from a = a + 1
>>>>
>>>> a = a.f()
>>>>
>>>> a .= f()
>>>>
>>>> seems like a bad idea
>>>>
>>>> i can hardly see the dot
>>>> why would i replace the object from which i'm calling the method in
>>>> most cases looks inefficient
>>>>
>>>>
>>>> On Mon, Aug 10, 2015 at 2:07 PM, Brendan Eich < <brendan at mozilla.org>
>>>> brendan at mozilla.org> wrote:
>>>>
>>>>> Do not send "Please add" messages with two-line, half-baked sketches
>>>>> of extensions to the language. That's just injecting noise with very little
>>>>> signal.
>>>>>
>>>>> The "-1" you received will be the answer if pressed from everyone on
>>>>> TC39, I would bet real money. Syntax is expensive, adding it for little
>>>>> semantic gain and some downside user-confusion risk (plus a small
>>>>> complexity tax hike for the language in full) is never the right answer.
>>>>>
>>>>> That you can scratch this itch (and many others like it) via sweet.js
>>>>> does not argue for incorporating any such =. or .= operator into the core
>>>>> language. Analyze developer patterns and nearby languages for better
>>>>> candidate extensions that solve more serious usability or greater issues.
>>>>>
>>>>> /be
>>>>>
>>>>>
>>>>> Florent FAYOLLE wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>>> x .= f() should be syntax sugar for x = x.f()
>>>>>>>
>>>>>>> x .= f().g().h() should be x = x.f().g().h()
>>>>>>>
>>>>>>
>>>>>> +1! I've made some weeks ago a prototype of this in sweet.js:
>>>>>> https://github.com/fflorent/member-access-assignment
>>>>>>
>>>>>> Except that the syntax is rather =. (I have probably been influenced
>>>>>> by the CoffeeScript's existential operator). The reverse looks fine to me
>>>>>> too.
>>>>>>
>>>>>> -1 Please no :)
>>>>>>>
>>>>>> Why?
>>>>>>
>>>>>> Florent
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>>>>
>>>>
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>>>
>>>
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-- 
Iago Sousa
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