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Great! So I'm not the only one believing that object orientation is
about objects. In Smalltalk, an object is an instance of a class. In
IoT, an object stands for a Thing. The same conceptual model applies
to both. Remember Alan Kay's definition of object orientation:<br>
<blockquote><i>Thus its semantics are a bit like having thousands
and thousands of computers all hooked together by a very fast
network. Questions of concrete representation can thus be
postponed almost indefinitely because we are mainly concerned
that the computers behave appropriately, and are interested in
particular strategies only if the results are off or come back
too slowly.</i><br>
</blockquote>
<br>
<div class="moz-cite-prefix">On 2020.06.03 05:15, Chris Muller
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANzdToHSZr0LxPe6P_ObX7TN2sBMfqMmy_tFG=uvY7RGSutKMA@mail.gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi <span style="color:rgb(0,0,0);font-size:13px">Trygve,</span>
<div><span style="color:rgb(0,0,0);font-size:13px"><br>
</span></div>
<div><font color="#000000">Of all the attributes that objects
print, I find the "type" (class) to be one of the least
interesting. It's usually already obvious in its contextual
usage. Indeed, it is the "identity" that I, too,
am interested in seeing printed. My solution since 2006 has
been an override of</font><span style="color:rgb(0,0,0)"> #printOn:
that adds a one-line dispatch to #printIdentificationOn:. I
then take care in my #</span>printIdentificationOn:
implementations to keep the printing as terse as it can be,
and sans any line endings, to serve this seemingly recurring
use-case I have of wanting a "short version" of an object's
string. For example,<span style="color:rgb(0,0,0)"> when
printing the elements of a collection. Having entire domain
hierarchies exclude the type entirely from their
printString's has been a fantastic experience. Seeing just
their identifications removes a level of formality that
seems to foster a better UI "connection" to the objects.</span></div>
<div><br>
</div>
<div>Regards,</div>
<div> Chris</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Jun 2, 2020 at 7:10 AM
Trygve Reenskaug <<a href="mailto:trygver@ifi.uio.no"
target="_blank" moz-do-not-send="true">trygver@ifi.uio.no</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> I find it frustrating to open 3 inspectors on different
objects, all of them titled 'aString' (or whatever),<br>
IMO, it is much better to open them on the 3 objects: [1234]
aString, [3456] a String, [4567 a String.<br>
The numbers in square brackets stand for the objects <i>oop</i>,
actually its <i>identityHash</i>. They can be a 7-digit
numbers; much too long for my short-time memory to hold many
of them. I therefore truncate the number to 4 digits,
accepting that I may, in rare cases, get 2 objects with the
same identifier.<br>
<br>
I'm running 'Squeak5.3'.
<blockquote><b>Object>>printOn: aStream</b><br>
"Append to the argument, aStream, a sequence of
characters that identifies the receiver."<br>
" The previous version identified the class, not
the instance "<br>
" This new version identifies the instance with
its oop. "<br>
" I arbitrarily truncate the oop to 4 digits to
simplify reading. "<br>
<br>
| title |<br>
title := self class name.<br>
aStream<br>
nextPutAll: '[' , (self asOop printString
truncateTo: 4) , ']' ;<br>
nextPutAll: (title first isVowel ifTrue: ['an
'] ifFalse: ['a ']);<br>
nextPutAll: title<br>
</blockquote>
Enjoy<br>
--Trygve<br>
<div>-- <br>
<div>
<p class="MsoNormal"><i><span lang="EN-US">The essence
of object orientation is that objects <span>collaborate<span>
</span>to</span> achieve a goal. </span></i><span
lang="EN-US"><br>
<span>Trygve</span> <span>Reenskaug</span> </span><span><a
href="mailto:%20trygver@ifi.uio.no"
target="_blank" moz-do-not-send="true"><span
lang="EN-US">mailto: trygver@ifi.uio.no</span></a></span><span
lang="EN-US"><br>
<span>Morgedalsvn</span>. 5A </span><span
style="font-size:10pt"><a
href="http://folk.uio.no/trygver/" target="_blank"
moz-do-not-send="true"><span lang="EN-US">http://folk.uio.no/trygver/</span></a></span><span
lang="EN-US"><br>
N-0378 Oslo </span><span><a
href="http://fullOO.info" target="_blank"
moz-do-not-send="true"><span lang="EN-US">http://fullOO.info</span></a></span><span
lang="EN-US"><br>
Norway Tel: (+47) 468 58 625 </span><span
style="font-size:10pt" lang="EN-US"></span></p>
</div>
</div>
</div>
<br>
</blockquote>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><i style="mso-bidi-font-style:normal"><span
style="font-size:10.0pt;mso-fareast-font-family:"Times New
Roman";mso-ansi-language:
EN-US" lang="EN-US">The essence of object orientation is
that objects <span class="GramE">collaborate<span
style="mso-spacerun:yes"> </span>to</span> achieve a
goal. </span></i><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
<span class="SpellE">Trygve</span> <span class="SpellE">Reenskaug</span> </span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman""><a href="mailto:%20trygver@ifi.uio.no"><span
style="mso-ansi-language:
EN-US" lang="EN-US">mailto: trygver@ifi.uio.no</span></a></span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";mso-ansi-language:
EN-US" lang="EN-US"><br>
<span class="SpellE">Morgedalsvn</span>.
5A </span><span style="font-size:10.0pt;
mso-fareast-font-family:"Times New Roman""><a
href="http://folk.uio.no/trygver/"><span
style="mso-ansi-language:EN-US" lang="EN-US">http://folk.uio.no/trygver/</span></a></span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
N-0378
Oslo </span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman""><a href="http://fullOO.info"><span
style="mso-ansi-language:EN-US" lang="EN-US">http://fullOO.info</span></a></span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
Norway Tel:
(+47) 468 58 625 </span><span
style="font-size:10.0pt;mso-ansi-language:
EN-US" lang="EN-US"><o:p></o:p></span></p>
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