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Re: Understanding someone's code

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tony@mountifield.org (Tony Mountifield) wrote on 30 Mar 2017 in
comp.lang.javascript: 

>> After:
>> 
>> F = 7;
>> a = 0;
>> if (a) {
>>      F = a;
>>      document.getElementById("pageNumber").value = a;
>> }
>> 
>> F will be 7, 
>> 
>> while after:
>> 
>> F = 7;
>> a = 0;
>> F = (F = a) && (document.getElementById("pageNumber").value = a);
>> 
>> F will be 0;
> 
> What's an initial assignment to F got to do with it? That wasn't in the
> original example. Nor was your outer assignment to F in the third line.

That does not matter, it shows both codes are not the same.

> Let's consider the original code piece by piece:
> 
> b.getPageInView && (a = b.getPageInView()) && (F = a,
> document.getElementById("pageNumber").value = a); 

[..]

Let's not
 
I am not responding to the exact code,
I am showing both codes are not the same.

That they get the same result in a specific instance,
where the value of F is unimportant, has nothing to do with it, 
as is this nonsense:

a = 3;

and 

a = 4;

are exactly the same if you do not use the value of a.


>> > If you believe
>> > it to be a wrong interpretation of the original code, why not provide
>> > a better one
>> 
>> This is not a church, 
>> faith does not come into coding,
>> faith being nonsense anyway.
> 
> s/believe/consider/ or s/believe/think/. I was using "believe" in one of
> those meanings, nothing to do with faith.

You used, I expected, 'believe' to show you trust your analysis without 
testing, which is dangerous in your own code, but undefentable if you try to 
get people to understand a certain manner of coding.

> Sounds like you have an axe to grind regarding the latter.

You must be a good listener to sounds. ;-)

>> > , instead of the unrelated and simple example below?
>> 
>> I try to teach to the best of my knowledge,
>> not take over the coding,
>> this NG not being a helpdesk.
> 
> That's true, it isn't. But if you volunteer to respond, it doesn't help
> if you don't answer the question asked.

"if you volunteer to help"?

Nonsense, this is not a helpdesk, 
and I don't "volunteer",
I respond because I want to respond.

I read in the somewhat convoluted code question the misunderstanding 
of the both peculear and usefull working the "&&" binary operator.

And my response was to the group, not just to the OP.

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Understanding someone's code Andrew Poulos <ap_prog@hotmail.com> - 2017-03-30 15:26 +1100
  Re: Understanding someone's code Andrew Poulos <ap_prog@hotmail.com> - 2017-03-30 18:48 +1100
    Re: Understanding someone's code "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-03-30 12:07 +0200
      Re: Understanding someone's code tony@mountifield.org (Tony Mountifield) - 2017-03-30 11:43 +0000
        Re: Understanding someone's code "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-03-30 14:00 +0200
          Re: Understanding someone's code tony@mountifield.org (Tony Mountifield) - 2017-03-30 13:44 +0000
            Re: Understanding someone's code "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-03-30 19:07 +0200
    Re: Understanding someone's code JJ <jj4public@vfemail.net> - 2017-03-30 18:58 +0700
      Re: Understanding someone's code Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-30 18:13 +0200
    Re: Understanding someone's code Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-30 18:13 +0200
      Re: Understanding someone's code John G Harris <niam@jghnorth.org.uk.invalid> - 2017-03-31 10:30 +0100
        Re: Understanding someone's code Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-04-02 14:41 +0200
          Re: Understanding someone's code John G Harris <niam@jghnorth.org.uk.invalid> - 2017-04-02 19:05 +0100
            Re: Understanding someone's code Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-04-10 05:00 +0200
              Re: Understanding someone's code John G Harris <niam@jghnorth.org.uk.invalid> - 2017-04-10 10:03 +0100

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