Subj : Re: Adding core-js (ES5+) polyfills
To   : Tracker1
From : Tracker1
Date : Thu Nov 05 2020 10:59 am

On 10/29/2020 8:41 PM, Tracker1 wrote:
> In the course of working with a few scripts, I've noticed many Js 
> language features I've come to rely on tend to be missing.
> 
> For example: Object.(entries|keys|values) and 
> Array.protype.(find|filter) etc.
> 
> The core-js polyfill library does seem to load without any issues into 
> the platform.  How would everyone feel about including it so that it can 
> be available to everyone closer to in the box?
> 
> Where to download the built+minified version
> https://cdnjs.com/libraries/core-js
> 
> The source library.
> https://github.com/zloirock/core-js
> 
> Note: this is pretty much the core of babel support for legacy browsers, 
> it's been pretty useful in Synchronet as well.  It does include some 
> polyfills for ES5 that are already built in, but since some behaviors 
> change slightly with ES6 it's best to include them all in practice, 
> shouldn't be anything that anyone notices though.
> 
> For example, instead of something like...
> 
>    var newsgroups = hdr.newsgroups.split(',');
>    for(n in newsgroups)
>    for(g in msg_area.grp_list)
>    for(s in msg_area.grp_list[g].sub_list)
>      if (
>        msg_area.grp_list[g].sub_list[s].newsgroup.toLowerCase()
>        == newsgroups[n].toLowerCase()
>    ) {
>      ... msg_area.grp_list[g].sub_list[s] ...
>    }
> 
> You could do...
> 
>    var newsgroups = hdr.newsgroups.split(',');
>    Object.values(msg_area.sub)
>      .filter(function(sub) {
>        return newsgroups.includes(sub.newsgroup.toLowerCase());
>      })
>      .foreach(function(sub) {
>         ... sub ...
>      });
> 
> Of course an updated spidermonkey would allow this to be...
> 
>    var newsgroups = hdr.newsgroups.split(',');
>    Object.values(msg_area.sub)
>      .filter(sub => newsgroups.includes(sub.newsgroup.toLowerCase())
>      .foreach(sub => {
>         ... sub ...
>      });
> 


-- 
Michael J. Ryan
tracker1 +o Roughneck BBS

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