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Groups > comp.lang.javascript > #38433

Re: HTML5 embed element event

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Michael Haufe (TNO) wrote:

> On Thursday, May 21, 2020 at 10:55:14 AM UTC-5, Michael Haufe (TNO) wrote:
>> ```
>> let featureNames = (obj: object): Set<PropertyKey> =>
>>   obj == null ? new Set() :
>>     new Set([
>>       ...Object.getOwnPropertyNames(obj),
>>       ...featureNames(Object.getPrototypeOf(obj))
>>     ])
>> ```
> 
> oops, I forgot to mention that was in TypeScript. JavaScript:
> 
> ```
> let featureNames = (obj) =>
>   obj == null ? new Set() :
>     new Set([
>       ...Object.getOwnPropertyNames(obj),
>       ...featureNames(Object.getPrototypeOf(obj))
>     ])
> ```

I forgot about Set.  I do not know what you mean by “featureNames”, or why 
you would pass a reference to a two-element Array.

The following would be equivalent to my original suggestion if one would 
write

  var properties = Object.create(null);

there instead:


function getAllPropertyNames (obj)
{
  /* Object instead of Array to avoid duplicates automatically */
  let properties = new Set();

  do {
    Object.getOwnPropertyNames(obj)
      .forEach(name => {set.add(name)});
  } while ((obj = Object.getPrototypeOf(obj)));

  return Array.from(properties.keys());
}

/* $0 in the Chrome Dev Console refers to the currently selected element 
node in the Tree Pane */
var el = $0;

getAllPropertyNames(el).filter(name => name.indexOf('on') === 0)
  .forEach(name => {
    el[name] = ((ev) => { console.log(ev); });
  });

ISTM that the advantage that Set provides in this case is too small.

-- 
PointedEars
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Thread

HTML5 embed element event Andrew Poulos <ap_prog@hotmail.com> - 2020-05-19 16:39 +1000
  Re: HTML5 embed element event "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-05-19 17:29 +0200
    Re: HTML5 embed element event Andrew Poulos <ap_prog@hotmail.com> - 2020-05-20 07:45 +1000
      Re: HTML5 embed element event "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-05-20 00:21 +0200
        Re: HTML5 embed element event rcpj@panix.com (Pierre Jelenc) - 2020-05-20 01:09 +0000
          Re: HTML5 embed element event Andrew Poulos <ap_prog@hotmail.com> - 2020-05-20 18:36 +1000
          Re: HTML5 embed element event "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-05-20 12:36 +0200
  Re: HTML5 embed element event "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-05-19 17:21 -0700
    Re: HTML5 embed element event Andrew Poulos <ap_prog@hotmail.com> - 2020-05-20 18:43 +1000
  Re: HTML5 embed element event Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-05-21 17:15 +0200
    Re: HTML5 embed element event "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-05-21 08:55 -0700
      Re: HTML5 embed element event "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-05-21 08:57 -0700
        Re: HTML5 embed element event Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-05-21 18:53 +0200
          Re: HTML5 embed element event "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-05-21 11:00 -0700
            Re: HTML5 embed element event Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-05-21 21:50 +0200
              Re: HTML5 embed element event Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-05-21 22:03 +0200
              Re: HTML5 embed element event "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-05-21 15:25 -0700
                Re: HTML5 embed element event Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-05-23 03:06 +0200

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