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Re: Inserting stuff received with AJAX into the DOM

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Cezary Tomczyk wrote:

> On 21/08/2017 22:16, Thomas 'PointedEars' Lahn wrote:
>> Cezary Tomczyk wrote:
>>> On 21/08/2017 17:47, Thomas 'PointedEars' Lahn wrote:
>>>> Cezary Tomczyk wrote:
>>>>> On 21/08/2017 16:44, Thomas 'PointedEars' Lahn wrote:
>>>>>> Cezary Tomczyk wrote:
>>>>>>> I am sure that:
>>>>>>>
>>>>>>> const par = document.createElement( 'p' );
>>>>>>>
>>>>>>> will always create HTML element. I can't see any real scenario where
>>>>>>> createElement method will return "something else than a reference to
>>>>>>> an object that has a method named “appendChild”" in that particular
>>>>>>> scenario.
>>>>>> Why?
>>>>> https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement
>>>>> […]
>>>> Certainly you can come up with something better than hearsay.
>>> Possibly there is a better explanation than just hearsay.
>> Possibly.  Can you come up with it?
> 
> No. I was expecting you'll do that.

That is precisely your fallacy here.  He who makes a claim carries the 
burden of proof to support it; not others carry the burden of proof to 
refute the same claim or prove the opposite claim.

>> This is not about not feature-testing the createElement() method.  It is
>> about testing its return value before using that.
> 
> Got it, but still I claim that in that particular case I would not test
> it.

It does not matter what you claim.  It matters on what kind of reasoning you 
are basing your (design) decisions.
 
>>> I might be wrong, but if there are cases that may strongly require "if"
>>> here then I'd like to know.
>> 
>> You are trying to shift the burden of proof again.  You have claimed that
>> this method can never return something unsuitable.  So how do *you*
>> support that claim *other* than with hearsay from MDN (I called it
>> “hearsay” because it is a wiki and there is no other reference attached
>> to your claim)?
>> You have claimed that this method can never return something unsuitable.
> 
> Let me clarify it: it may return something unexpected, but I've never
> tested return value from createElement method before I use it because 1)
> it was always working as expected and 2) I haven't got any scenario
> where I could say it's required.

That is precisely the problem.  Your decisions are apparently based only on 
wishful thinking.
 
>> So, what if no exception is being thrown by a method, would you not want
>> to make sure as best as you can that the return value of a method is
>> actually a reference to an object, before you attempt to access its
>> properties?
> 
> Generally yes, but as for the returns from createElement method I do not
> do that.

Not being based on sound reasoning, your decision-making process is not 
logical.
 
>>> and unless it's not modified it has been always working quite good.
>> Based on what *data*?
> 
> Own experience.

Do you realize that one’s experience is limited?
 
> I'd rather strongly urge to give me a scenarios where createElement
> method returns something different than created HTML element. I'd like
> to understand why do I need to test a return value of createElement
> method if it's actually a reference to an object, before I attempt to
> access to it's properties.

You are trying to shift the burden of proof again.  I am not playing that 
game.

Also, please trim your quotes from now on.

.
.
.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | <http://PointedEars.de/es-matrix>
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.

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Inserting stuff received with AJAX into the DOM bit-naughty@hotmail.com - 2017-08-19 12:35 -0700
  Re: Inserting stuff received with AJAX into the DOM bit-naughty@hotmail.com - 2017-08-19 12:55 -0700
    Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-20 12:16 +0200
      Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-20 15:55 +0200
        Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-20 19:18 +0200
          Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-20 21:50 +0200
            Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-20 22:39 +0200
              Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-21 08:29 +0200
                Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-21 16:44 +0200
                Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-21 17:24 +0200
                Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-21 17:47 +0200
                Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-21 19:50 +0200
                Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-21 22:16 +0200
                Re: Inserting stuff received with AJAX into the DOM Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2017-08-26 09:25 +0200
                Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-27 03:02 +0200
  Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-20 12:30 +0200
  Re: Inserting stuff received with AJAX into the DOM bit-naughty@hotmail.com - 2017-08-20 07:37 -0700
    Re: Inserting stuff received with AJAX into the DOM "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-08-20 17:17 +0200
    Re: Inserting stuff received with AJAX into the DOM Tim Streater <timstreater@greenbee.net> - 2017-08-20 17:48 +0100
  Re: Inserting stuff received with AJAX into the DOM bit-naughty@hotmail.com - 2017-08-20 11:21 -0700
    Re: Inserting stuff received with AJAX into the DOM Tim Streater <timstreater@greenbee.net> - 2017-08-20 19:29 +0100
    Re: Inserting stuff received with AJAX into the DOM "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-08-21 01:29 +0200
      Re: Inserting stuff received with AJAX into the DOM Andrew Poulos <ap_prog@hotmail.com> - 2017-08-21 16:29 +1000
        Re: Inserting stuff received with AJAX into the DOM "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-08-21 12:25 +0200
        Re: Inserting stuff received with AJAX into the DOM Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-21 16:47 +0200

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