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

Yes, but in javascript it is dynamic and we also have tre different type of
copys:

Referential copy:

myNewObject = myObject

anything you do in myNewObject will also affect myObject even if
myNewObject is only a part of myObject like
myNewObject = myObject[1]

Shallow copy

myJSON = JSON.stringify(myObject)
myNewObject = JSON.parse(myJSON)

There is no reference between myNewObejct and myObject however any
functions aint copied since JSON don support datatype function.

Deep Copy

myNewObject = new myObject

There is no reference between myNewObject and myObject and myNewObject will
be a exact copy of myObject.

On Wed, Jul 5, 2017 at 5:53 PM, jacobus erps <jacobus.erps@xxxxxxxxx> wrote:

Henrik, now you got me...

However, one of the supported types is "pointer".
And now i'm thinking of it (thanks) i need to support not only "pointer"
but also "procedure pointer".

JavaScript is very flexible and mallable, no contest there.
Functions as first-class citizens, i know.

On Wed, Jul 5, 2017 at 5:49 PM, Henrik Rützou <hr@xxxxxxxxxxxx> wrote:

Until you reach parm5 where you inject a function into the object;-)

myObject[1].parm5 = function(msg) { alert(msg) }

and execute it

myObject[1].parm5("Hello Jacobus")

On Wed, Jul 5, 2017 at 5:20 PM, jacobus erps <jacobus.erps@xxxxxxxxx>
wrote:

Henrik,

With the map impl. i'm about to release you can do the same (well sort

of):

Create the map:

map = rm_m(
rm_a('parm1') : rm_v( rm_i(1) : rm_i(2) : rm_i(3) ) :
rm_a('parm2') : rm_v( rm_i(4) : rm_i(5) : rm_i(6) ) );

This map has as key "parm1" with a list (vector) containing 1, 2, 3;

Now i add 4 to this list

rm_ins( rm__a(map:'parm1') : rm_i(4) : rm_i(4) );

rm_v actually creates a special map, where the keys are implied (i.e.

they

keys will automatically become 1,2,3 etc).

On Wed, Jul 5, 2017 at 5:01 PM, Henrik Rützou <hr@xxxxxxxxxxxx> wrote:

When you talk about dynamic array's in rpg you talk about no. of

elements

not as in javascript
where you may define a array within an array or an object completely
dynamical

myObject = [
{ parm1 : "aaa", parm2 : [1,2,3,4] },
{ parm1 : "bbb", parm2 : [5,6,7,8] }
]

and then add parm3 and parm4 to the obejct in array element 1 in

myObject

myObject[1].parm3 = "tralala"
myObject[1].parm4 = ["a","b","c"]

Try to do that in RPG and remember there is no dcl statements

involved!

On Wed, Jul 5, 2017 at 4:37 PM, John Yeung <

gallium.arsenide@xxxxxxxxx

wrote:

[Cross-posted to RPG400-L and OPENSOURCE]

On Wed, Jul 5, 2017 at 9:39 AM, jacobus erps <

jacobus.erps@xxxxxxxxx

wrote:

What RPG misses is a vibrant eco system.
There are no standard libraries to speak of.
Lack of dynamic datastructures, like maps.

I certainly agree on the lack of standard libraries. I would
characterize RPG's ecosystem this way: Fledgling, underpublicized,
growing. I agree it's not "vibrant" yet, but that may change. It's
definitely going in the direction of vibrancy.

There was a recent mini-flurry of Stack Overflow questions by

someone

who has been working on their own dynamic data structures for RPG.
(You're not that someone, are you?) Their results so far are here:

<https://github.com/lppedd/RPG>

Dynamic arrays for RPG have been available for many years now from

at

least Mihael Schmidt and Aaron Bartell, perhaps also others I'm not
aware of. (As I said, underpublicized.)

I'm currently working on a versatile map implementation for RPG,

hope

to

release it soon as an open source project.
The map may contain any combination of key/item data types

(integer,

packed

decimal, date, etc), iteration is done through cursors with
setll/setgt/read/readp/reade semantics.
The keys and items in a map maybe other maps too.

The Stack Overflow activity I mentioned above culminated in a

HashMap

implementation. I'm not sure it's as flexible as what you've

described

(allow a map to be a key?), but it ought to work very much like

Java's

HashMap.

I'm not too familiar with Java actually, but I know Python pretty
well, and its built-in mapping structure (called "dictionary")

doesn't

allow keys to be mutable. Among other things, this prevents you

from

inadvertently mutating one key so that it becomes equal to another
key.

If you're not LppEdd (Edoardo Luppi), you probably ought to at

least

check out what they've already done. For reference, the most

relevant

Stack Overflow question was this:

<https://stackoverflow.com/questions/44461953/hashmap-implem
entation-rpgle>

John Y.
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