January 24, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Matthew | On Tue, 25 Jan 2005 08:08:27 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
> "Georg Wrede" <georg.wrede@nospam.org> wrote in message
>> IMO if(x) should be made the official form of this idiom, in D.
>>
>> And documented as such.
>>
>> Every language has its preferred idioms, and every idiom can be attacked as unobvious, dangerous, etc. But having
>> these idioms is what makes the language more fluent and usable.
>>
>> The standard idioms make source code much more readable.
>
> That's nice, and in almost all other ways I've fallen into line with the D way of things - no more whinges about
> boolean, using dCaseMethods, etc. etc. But there's no way I'm writing non-boolean conditional (sub-)expressions. Sorry.
Now I'm curious. Why not?
Regan
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January 24, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to agent.smith | agent.smith@archvillain.com wrote:
>>>if( x.valid ) // new property of pointers
>>
>>What if x is null, though ? Does null have any properties ?'
>
> variable x has properties, since it has a type.
> Nullness or non-nullness is a run-time condition. The existence
> of the property is determined at compile-time; the value
> is determined at run-time.
Right, properties work even on null objects. Such as length on char[],
which returns 0 for null strings. (comes in handy when comparing them)
It's just things such as equality that fails to check on null objects.
As in: if (null == x), which works for pointers but fails for objects.
Forgot that, thanks.
--anders
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Regan Heath |
"Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4lnexa23k2f5@ally...
> On Tue, 25 Jan 2005 08:08:27 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>> "Georg Wrede" <georg.wrede@nospam.org> wrote in message
>>> IMO if(x) should be made the official form of this idiom, in D.
>>>
>>> And documented as such.
>>>
>>> Every language has its preferred idioms, and every idiom can be attacked as unobvious, dangerous, etc. But having these idioms is what makes the language more fluent and usable.
>>>
>>> The standard idioms make source code much more readable.
>>
>> That's nice, and in almost all other ways I've fallen into line with the D way of things - no more whinges about boolean, using dCaseMethods, etc. etc. But there's no way I'm writing non-boolean conditional (sub-)expressions. Sorry.
>
> Now I'm curious. Why not?
Just experience over these long years. Explicit boolean conditional (sub-)expressions never cause problems. Implicit ones sometimes do. Therefore I adopt a habit of always doing it to avoid the occasional cases. QED
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Matthew | On Tue, 25 Jan 2005 12:56:53 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
> "Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4lnexa23k2f5@ally...
>> On Tue, 25 Jan 2005 08:08:27 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>>> "Georg Wrede" <georg.wrede@nospam.org> wrote in message
>>>> IMO if(x) should be made the official form of this idiom, in D.
>>>>
>>>> And documented as such.
>>>>
>>>> Every language has its preferred idioms, and every idiom can be attacked as unobvious, dangerous, etc. But having
>>>> these idioms is what makes the language more fluent and usable.
>>>>
>>>> The standard idioms make source code much more readable.
>>>
>>> That's nice, and in almost all other ways I've fallen into line with the D way of things - no more whinges about
>>> boolean, using dCaseMethods, etc. etc. But there's no way I'm writing non-boolean conditional (sub-)expressions.
>>> Sorry.
>>
>> Now I'm curious. Why not?
>
> Just experience over these long years. Explicit boolean conditional (sub-)expressions never cause problems. Implicit
> ones sometimes do. Therefore I adopt a habit of always doing it to avoid the occasional cases. QED
I use them all the time.. I've never had any trouble (that I can remember), can you give me an example you've run into (I might want/need to scan my recent code for it).
Regan
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Regan Heath |
"Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4y49nq23k2f5@ally...
> On Tue, 25 Jan 2005 12:56:53 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>> "Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4lnexa23k2f5@ally...
>>> On Tue, 25 Jan 2005 08:08:27 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>>>> "Georg Wrede" <georg.wrede@nospam.org> wrote in message
>>>>> IMO if(x) should be made the official form of this idiom, in D.
>>>>>
>>>>> And documented as such.
>>>>>
>>>>> Every language has its preferred idioms, and every idiom can be attacked as unobvious, dangerous, etc. But
>>>>> having
>>>>> these idioms is what makes the language more fluent and usable.
>>>>>
>>>>> The standard idioms make source code much more readable.
>>>>
>>>> That's nice, and in almost all other ways I've fallen into line with the D way of things - no more whinges about boolean, using dCaseMethods, etc. etc. But there's no way I'm writing non-boolean conditional (sub-)expressions. Sorry.
>>>
>>> Now I'm curious. Why not?
>>
>> Just experience over these long years. Explicit boolean conditional (sub-)expressions never cause problems. Implicit ones sometimes do. Therefore I adopt a habit of always doing it to avoid the occasional cases. QED
>
> I use them all the time.. I've never had any trouble (that I can remember), can you give me an example you've run into (I might want/need to scan my recent code for it).
Well, naturally not. Since I have been doing it this way for about 5 years, I don't have any real ones to offer up. :-)
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Matthew | On Tue, 25 Jan 2005 15:16:46 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
> "Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4y49nq23k2f5@ally...
>> On Tue, 25 Jan 2005 12:56:53 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>>> "Regan Heath" <regan@netwin.co.nz> wrote in message news:opsk4lnexa23k2f5@ally...
>>>> On Tue, 25 Jan 2005 08:08:27 +1100, Matthew <admin.hat@stlsoft.dot.org> wrote:
>>>>> "Georg Wrede" <georg.wrede@nospam.org> wrote in message
>>>>>> IMO if(x) should be made the official form of this idiom, in D.
>>>>>>
>>>>>> And documented as such.
>>>>>>
>>>>>> Every language has its preferred idioms, and every idiom can be attacked as unobvious, dangerous, etc. But
>>>>>> having
>>>>>> these idioms is what makes the language more fluent and usable.
>>>>>>
>>>>>> The standard idioms make source code much more readable.
>>>>>
>>>>> That's nice, and in almost all other ways I've fallen into line with the D way of things - no more whinges about
>>>>> boolean, using dCaseMethods, etc. etc. But there's no way I'm writing non-boolean conditional (sub-)expressions.
>>>>> Sorry.
>>>>
>>>> Now I'm curious. Why not?
>>>
>>> Just experience over these long years. Explicit boolean conditional (sub-)expressions never cause problems. Implicit
>>> ones sometimes do. Therefore I adopt a habit of always doing it to avoid the occasional cases. QED
>>
>> I use them all the time.. I've never had any trouble (that I can remember), can you give me an example you've run
>> into (I might want/need to scan my recent code for it).
>
> Well, naturally not. Since I have been doing it this way for about 5 years, I don't have any real ones to offer up. :-)
Oh... maybe someone else can come up with one? anyone?
Regan
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to John Reimer | On 2005-01-21 08:14:02 -0600, John Reimer <brk_6502@yahoo.com> said:
> Anders F Björklund wrote:
>
>> PS. I take it that's another one against "aint" ?
>
> Heh, "aint" just doesn't cut it. :-)
I think 'aint' would be great!
if (p aint null) ill_be_damed ();
if (you aint good) goto hell;
Now as a Texan, that's speaking my language. ;-)
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Anders F Björklund | On 2005-01-21 09:14:11 -0600, =?UTF-8?B?QW5kZXJzIEYgQmrDtnJrbHVuZA==?= <afb@algonet.se> said: > parabolis wrote: > >>> But if you really like some new words, then I suggest ≥ and ≤ ? >> >> I absolutely agree with this suggestion. I would further it by suggesting "≡≡" and "!≡" replace the current "is" > > No, not replace. As an *alternative* to the US-ASCII syntax. > And that should be ≡ for '===', and ≢ for '!==' by the way. > > http://www.prowiki.org/wiki4d/wiki.cgi?FeatureRequestList/UnicodeOperators > > --anders Yes I agree! I think it makes for more easily readable and compact looking code. I would love to see this. |
January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Brian Chapman | Brian Chapman wrote:
> if (p aint null) ill_be_damed ();
I don't generally correct spelling errors but I think you meant 'ahl_be_dahmned();' ; )
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January 25, 2005 Re: What is the difference between 'is' and '==='? | ||||
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Posted in reply to Brian Chapman | Brian Chapman wrote: >> No, not replace. As an *alternative* to the US-ASCII syntax. >> And that should be ≡ for '===', and ≢ for '!==' by the way. >> >> http://www.prowiki.org/wiki4d/wiki.cgi?FeatureRequestList/UnicodeOperators > > Yes I agree! I think it makes for more easily readable and compact looking code. I would love to see this. The following were suggested, as a start: > ≟ may be used instead of == > ≠ may be used instead of != > ≤ may be used instead of <= > ≥ may be used instead of >= > ≡ may be used instead of === > ≢ may be used instead of !== > ∧ may be used instead of && > ∨ may be used instead of || (printed using the following D program:) > void main() > { > printf("\u225F may be used instead of ==\n"); > printf("\u2260 may be used instead of !=\n"); > printf("\u2264 may be used instead of <=\n"); > printf("\u2265 may be used instead of >=\n"); > printf("\u2261 may be used instead of ===\n"); > printf("\u2262 may be used instead of !==\n"); > printf("\u2227 may be used instead of &&\n"); > printf("\u2228 may be used instead of ||\n"); > } It's one way to put the UTF-8 to some use... --anders PS. Here's images, if your browser is Unicode-challenged: http://www.fileformat.info/info/unicode/char/225F/index.htm http://www.fileformat.info/info/unicode/char/2260/index.htm http://www.fileformat.info/info/unicode/char/2264/index.htm http://www.fileformat.info/info/unicode/char/2265/index.htm http://www.fileformat.info/info/unicode/char/2261/index.htm http://www.fileformat.info/info/unicode/char/2262/index.htm http://www.fileformat.info/info/unicode/char/2227/index.htm http://www.fileformat.info/info/unicode/char/2228/index.htm |
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