Re: RPG easier/harder to use than other languages? -- RPG400-L

There is nowhere written that a program must be one or the other, it all
depends on what the program does.

Most OLTP program runs on a DB model with columns and rows with that,
converted to JSON, becomes an array with objects that has properties
(fields) that may go (in javascript) directly into a function object with
methods where the function object even may be inhereted from a general
function object so you are able to add functionality around the original
data model.

And here comes quite a difference between RPG and Javascript when calling
function and methods:

RPG and old javascript predefined function call:
rc = myFunction(parm1, parm2, parm3, parm4, parm5)

Today's way to call complex javascript functions:
rc= myFunction( { parm1 : "aaa", parm5 : "eee", parm4 : "ddd", parm10 :
"jjj" } )

No need to sequence parameters (properties) and it may include/exclude
parameters (properties) because there isn't any predefinitions of what an
object contains.

On Fri, Jul 7, 2017 at 1:49 PM, jacobus erps <jacobus.erps@xxxxxxxxx> wrote:

OOP/FP/Procedural are all programming styles, which one to apply, and how
much, depends on the situation.
E.g. OOP lends itself well to GUI programming, where you have "widgets",
and new "widgets" can be created subclassing other widgets.
For business logic, procedural (with some FP ideas such as immutable data
structures) is maybe a better match than OOP (i'm not sure).

However, the critique comes mainly because OO has been seriously oversold
in the 90's to managerment types, with the promise of software "factories",
populated by workers that create new software just be clicking existing
components together.

On Fri, Jul 7, 2017 at 12:54 PM, Jonathan Wilson <
piercing_male@xxxxxxxxxxx>
wrote:

On Thu, 2017-07-06 at 11:52 -0400, Jon Paris wrote:

This is quite an enjoyable and informative read

https://medium.com/@cscalfani/goodbye-object-oriented-
programming-a59cda4c0e53 <https://medium.com/@cscalfani/goodbye-object-
oriented-programming-a59cda4c0e53>

And this https://content.pivotal.io/blog/all-evidence-points-to-

oop-being-bullshit <https://content.pivotal.io/
blog/all-evidence-points-to-oop-being-bullshit>

Jon Paris

I wonder if one of the reasons why OO is, or seems, less applicable to
the "400" is that like the OS, programs have always been "object based".
OO was a resolution to a problem that was not [as] applicable to the i's
environment in that while programs often accessed many disparate files
and did a large amount of validation (sometimes replicated across
multiple programs) the programs themselves were very self contained. An
order entry system had a program to maintain the order header, and a
program to maintain the order detail, which called a program to search
and select a stock item, which could also call a program to display the
stock item details.

I think one of the reasons why it was possible to write so many
programs, each one specific to a generalised task, was the speed at
which a program could be invoked in comparison to a "PC" program (even a
simple hello world). Although that said, when you're invoking a called
program 10's of thousands of times on the i even that speed of
invocation becomes limiting which is why externalised subprocedures are
just awesome, along with the increase in re-usable building/logic blocks
- its more of a granular improvement rather than a paradigm shift.
(Multiple modules in a service program, I feel, are more about code
organisation than the finalised implementation.)

PC programs however were getting bigger and bigger and having to handle
the gui, the input logic, and processing logic, and data logic, and file
logic... so OO seemed like a good way of introducing the fine grained
control that we, to some degree, take for granted on the i because its
second nature to break an "application" in to smaller isolated
"programs" (or objects) and we also had the advantage that the "ui"
processing was all handled by the system and was genuinely externalised
from the program (treated as a file) instead of being embedded, or
interwoven, with the validation processing logic.

Oh, and then there is the whole ecosystem that we take for granted.
Messaging as fundamental part of both the system and the application
programming languages (along with system wide message files), job logs
(as a kind of side affect of messaging), job queues that hide the
complexity of spawning "background" tasks or fiddling around with task
manager and the completion of the tasks being notified by the in built
messaging system... and so on; even down to the little panel on the
front that would give you chapter and verse (once you looked up the
codes) on why the thing had failed to power on - no silly beeps as the
only clue (heck even PC's now, finally, have got around to having a
little 2 digit SRC display on the motherboard years after the S36 had it
[my first experience with "midrange" kit after leaving school, which had
BBC micros and Comodor Pet's]).

And last, but by no means least, an integrated database with record
locking, concurrency, journaling, journal auditing (viewing/extraction),
commitment control...

Jon.

www.partner400.com
www.SystemiDeveloper.com

On Jul 4, 2017, at 7:02 PM, Richard Schoen <

Richard.Schoen@xxxxxxxxxxxxxxx> wrote:

Do you have some examples of how these former disgrunted OO devs have

found OO programming to be flawed ?

Just curious since your statement seems pretty generic.

Regards,

Richard Schoen
Director of Document Management
e. richard.schoen@xxxxxxxxxxxxxxx
p. 952.486.6802
w. helpsystems.com

------------------------------

message: 2
date: Tue, 4 Jul 2017 01:37:25 +0000
from: Justin Taylor <JUSTIN@xxxxxxxxxxxxx>
subject: RE: RPG easier/harder to use than other languages?

I'm seeing a number of disgruntled former OO devs these days claim

that OO is flawed in concept. Personally I haven't done enough to have

my

own opinion. I have seen some crazy designs where people try to force a
strict "text book" OO solution over problems where that concept doesn't
really seem to fit.

-----Original Message-----
From: Raul A Jager W [mailto:raul@xxxxxxxxxx]
Sent: Monday, July 03, 2017 5:32 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: RPG easier/harder to use than other languages?

Lots of business needs are better served by OLTP and relational

database rather than OO. Sure, for the user interface OO is great, so use
javascript in the browser and RPG in the server. Do not use 5250. Do not
use "screen scrapers". Develop for web.

How do you classify a language as modern or not? The OO model is

quite

old. Java is showing its age to. Python is from the 80s.

Is OO the right tool for everything? Interpreted languages require

very careful testing, and control over the input.

When there are lots of transactions, a compiled language like RPG or

Cobol will enable the same processor to handle easily 20 times more
transactions than the same code in PHP. Moore law does not work anymore,
the speed has remained at 4 GH since the last 10 years or more. It is

far

more expensive to set up 20 servers rather than the difference of cost
between developing in PHP or RPG.

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