Re: Object.create(canvas.getContext())

From	Jan Bruns <ebay@abnuto.de>
Newsgroups	comp.lang.javascript
Subject	Re: Object.create(canvas.getContext())
Date	2017-11-19 21:39 +0000
Organization	MB-NET.NET for Open-News-Network e.V.
Message-ID	<oustnb$gbb$1@gwaiyur.mb-net.net> (permalink)
References	(1 earlier) <5326256.lOV4Wx5bFT@PointedEars.de> <ouel6d$nvu$1@gwaiyur.mb-net.net> <1754058.usQuhbGJ8B@PointedEars.de> <oungju$hmt$1@gwaiyur.mb-net.net> <10957516.O9o76ZdvQC@PointedEars.de>

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Thomas 'PointedEars' Lahn:
> Jan Bruns wrote:

>> this.define_method = function(nam,cobj,cfun){
>> 
>>  this[nam] = function() { return cfun.apply(cobj,arguments); };
>> 
>> };
>> 
>> this.inherit_methods = function(o) {
>> 
>>   for (var i in o) { if (typeof(o[i])=="function") {
>> 
>>     this.define_method(i,o,o[i]);
>> 
>> };};};
>> 
>> 
>> this.inherit_methods(gl);
>> 
>> Looks much more human readable to me.
 
> YMMV.  But your code is also much more error-prone 

Well, it comes with useful flexibility.

For example, some webgl extensions come with additional methods that have 
been adopted to webgl2.

With webgl1 they're used like

  var e = gl.getExtension(some_name);

  e.someMethod_suffix(); // call some extension's method

whereas in webgl2, they've become part of the API:

  gl.someMethod();

So it'll simply be best to load the extension with:

  var e = gl.getExtension(some_name);
  gl.define_method("someMethod",e,e.someMethod_suffix);


> (and lacks code style).

Style? My newsreader is broken (I think). Somehow linebreaks get lost 
somewhere, probably to get some format-flowed styling.

> For example, there is a reason why I enclosed the host object property
> access in a “try” block.

What is that reason? Does "typeof" throw on any enumerated property 
anywhere?


Gruss

Jan Bruns

Thread

Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-12 10:09 +0000
  Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-12 17:42 +0100
    Re: Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-14 11:48 +0000
      Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-15 02:32 +0100
        Re: Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-17 20:25 +0000
          Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-19 05:48 +0100
            Re: Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-19 21:39 +0000
              Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-19 23:34 +0100
                Re: Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-20 14:47 +0000
                Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-21 04:07 +0100
                Re: Object.create(canvas.getContext()) Jan Bruns <ebay@abnuto.de> - 2017-11-21 16:23 +0000
                Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-22 04:12 +0100
  Re: Object.create(canvas.getContext()) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-11-12 18:45 +0100

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