module exports

[Andrea Giammarchi]

I like that more I read about this, more the `with` statement comes into my
mind ...

> console.log(foo); // Oh, yeah, this really means module1.foo

looks like that

> changeFoo();

here the implicit context ? ... if so, I have no idea which one it is and
why ... also, can I change it?
Maybe I asked for a function utility, not for a trapped context bound into
an exported function I cannot change later on

> console.log(foo); // Ok, since this is secretly module1.foo, the result
'10' makes sense.

nope, not at all, at least here

Cheers



On Fri, Mar 14, 2014 at 9:27 AM, John Barton <johnjbarton at google.com> wrote:

> I've used es6 modules for several months now and I'm curious to know when
> I would want to leverage mutable bindings.
>
> I guess I need to begin to imagine that variables bound to imports are
> really a kind of property name of s secret object:
>
> import { foo, changeFoo } from "./module1";
>
> console.log(foo); // Oh, yeah, this really means module1.foo
> changeFoo();
> console.log(foo); // Ok, since this is secretly module1.foo, the result
> '10' makes sense.
>
> jjb
>
> On Fri, Mar 14, 2014 at 7:40 AM, Domenic Denicola <
> domenic at domenicdenicola.com> wrote:
>
>>
>> ```js
>>
>> // module1.js
>> export let foo = 5;
>> export function changeFoo() {
>>     foo = 10;
>> }
>>
>> // module2.js
>> import { foo, changeFoo } from "./module1";
>>
>> // Import imports mutable bindings
>> // So calling changeFoo will change the foo in current scope (and
>> original scope)
>>
>> console.log(foo); // 5
>> changeFoo();
>> console.log(foo); // 10
>>
>> // module3.js
>> module module1 from "./module1";
>> let { foo, changeFoo } = module1;
>>
>> // Destructuring uses assignment to copy over the current values
>> // So calling changeFoo does not affect this binding for foo
>>
>> console.log(foo); // 5
>> changeFoo();
>> console.log(foo); // 5
>>
>>
>>
>>
>>
>> From: John Barton <johnjbarton at google.com>
>> Sent: Friday, March 14, 2014 10:35
>> To: Domenic Denicola
>> Cc: Mark Volkmann; Kevin Smith; es-discuss at mozilla.org
>> Subject: Re: module exports
>>
>>
>> What is a 'mutable binding'?
>>
>>
>>
>> On Fri, Mar 14, 2014 at 7:30 AM, Domenic Denicola  <
>> domenic at domenicdenicola.com> wrote:
>>
>>
>> Importing is nothing like destructuring. You import mutable bindings; you
>> don't do assignment. I'm very glad that different syntax is used for each
>> case.
>>
>>
>>
>> From: Mark Volkmann <r.mark.volkmann at gmail.com>
>> Sent: Friday, March 14, 2014 10:19
>> To: Kevin Smith
>> Cc: Domenic Denicola;  es-discuss at mozilla.org
>> Subject: Re: module exports
>>
>>
>>
>>
>> I understand it's hard to make changes after a certain point. It's too
>> bad though that developers will have to remember that the way to import a
>> few things from a module is:
>>
>>
>> import {foo, bar} from 'somewhere';
>>
>>
>> but the way to import the whole module is:
>>
>>
>> module SomeModule from 'somewhere';
>>
>>
>> instead of
>>
>>
>> import SomeModule from 'somewhere';
>>
>>
>> It just seems so clean to say that if you want to import something, you
>> always use the "import" keyword.
>>
>>
>>
>> On Fri, Mar 14, 2014 at 9:12 AM, Kevin Smith  <zenparsing at gmail.com>
>> wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>     export { foo as default };
>>
>>
>>
>> I fail to see why sugar over this form is necessary.
>>
>>  I completely agree. Plus if this is taken away then the "import" keyword
>> can be used to get the whole module as in my example above. At that point
>> maybe there is no need for the "module" keyword.
>>
>>
>> Maybe, but at this point that would be too big of a change to swallow.  I
>> think if we can just focus on eliminating this one pointless and confusing
>> aspect (the export default [expr] form), we'll be good to go.
>>
>>
>>
>>
>>
>>
>>
>>  --
>> R. Mark Volkmann
>> Object Computing, Inc.
>> _______________________________________________
>> es-discuss mailing list
>> es-discuss at mozilla.org
>> https://mail.mozilla.org/listinfo/es-discuss
>>
>>
>>
>>
>
>
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