[FRIAM] What is an object?

[Prof David West]

Alan Kay is the coiner of the term Object-oriented Programming and the
biological cell metaphor. In later years he thought that programmers
might have had a better chance of writing object code if there was a
clearer distinction between OO Design implemented with Message-
oriented programming. This might have prevented the horrible mistake
of equating an object (ala Kay) with an "abstract data type" (ala
Stroustrup and C++).


On Tue, Jul 17, 2018, at 10:09 PM, Alfredo Covaleda Vélez wrote:
> I do not know if Alan Kay created the term object in the context of
> programming  but he was a pioneer of OOP when created Smalltalk. These
> are few paragraphs where Kay is cited in relation to the term object
> and concept is explained.> 
> https://www.yegor256.com/2017/12/12/alan-kay-was-wrong.html
> 
> Felicidades para todos.   
> 
> On Tue, Jul 17, 2018 at 10:19 PM, Marcus Daniels
> <marcus at snoutfarm.com> wrote:>> One can also have procedures bound to types where the procedures
>> are pure.>>  OOP does not imply methods that have privileged access to state,
>>  although this is common with languages like C++ and Java.>>  In contrast, a method (or type bound procedure) can have privileged
>>  access to the meaning of state when state is provided (as an
>>  argument).>>  Haskell basically requires this approach and Fortran 2008
>>  facilitates it.>> 
>> 
>> On 7/17/18, 9:05 PM, "Friam on behalf of Russell Standish" <friam-
>> bounces at redfish.com on behalf of lists at hpcoders.com.au> wrote:>> 
>>      Not sure about "utility"/"tool", but an object is distinguished
>>      from a>>      function by having state. Call an object's method, and the
>>      method's>>      scope is populated by the object's data members, which of
>>      course,>>      differ from object to object.
>> 
>>      By contrast a function either has no state (pure function), or
>>      its>>      state is global (same for every function invocation).
>> 
>>      Cheers
>> 
>>      On Tue, Jul 17, 2018 at 10:06:57PM -0400, Nick Thompson wrote:
>>      > Dave, and anybody else who wants to play. 
>>      > 
>>      >  
>>      > 
>>      > I have always been puzzled by the question of how one
>>      > distinguishes an>>      > object in object programming from a utility in DOS or a tool
>>      > in Matlab.  Or>>      > any mathematical function, for that matter.  You give it what
>>      > it needs, and>>      > it gives you what it's supposed to, and you don't give a damn
>>      > how it works.>>      > 
>>      >  
>>      > 
>>      > Please don't yell at me.
>>      > 
>>      >  
>>      > 
>>      > Nick 
>>      > 
>>      >  
>>      > 
>>      > Nicholas S. Thompson
>>      > 
>>      > Emeritus Professor of Psychology and Biology
>>      > 
>>      > Clark University
>>      > 
>>      > http://home.earthlink.net/~nickthompson/naturaldesigns/
>>      > 
>>      >  
>>      > 
>> 
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>> 
>>      -- 
>> 
>>      ----------------------------------------------------------------
>>      ------------>>      Dr Russell Standish                    Phone 0425 253119
>>      (mobile)>>      Principal, High Performance Coders
>>      Visiting Senior Research Fellow        hpcoder at hpcoders.com.au
>>      Economics, Kingston University
>>      http://www.hpcoders.com.au>>      ----------------------------------------------------------------
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