World: r3wp

thanks all the same.

contexts... also a deep topic. objects in rebol are contexts. there 
are not really prototypes as any object can act as one.

@Henrik, I still am not sure what prototypes are. So REBOL uses a 
different structure called a CONTEXT and not an OBJECT?

try:

source context

Some object oriented programming languages use specially notated 
prototype objects, from which other objects can be created. REBOL 
does not. You simply have objects. Prototypes here would be only 
a concept that you use as a part of your program to discern a "mother" 
object from other objects.

@Henrik, so prototypes are nested objects and the fact rebol only 
deals in objects goes back to its homoiconicity?

I think not. The prototype is any object you inherit from ...

no, prototypes don't exist at all.

Following document might be a bit dated, but it still contains some 
usefull explanation of REBOL core concepts ... http://www.rebol.com/docs/core23/rebolcore.html

it's simpler than one might think:

if you have two objects, one made from the other:

a: make object! [num: 5]
b: make a [num: 7]


if you do this without showing this part to another person, that 
person can't tell which object came first, only that two objects, 
A and B exist in memory. so there are no real prototypes.

@Pekr, @Henrik, ok.

Henrik, I have to object. REBOL is prototype based. Any REBOL object/context 
is a prototype

Some object oriented programming languages use specially notated 
prototype objects, from which other objects can be created.

Those are not called prototypes; those are called classes

Todun, contexts and objects are the same in REBOL. The object word 
is just used as an alias name because other languages call them that

you are probably right, Kaj.

I had classes and prototypes confused, if I'm not mistaken. So REBOL 
doesn't have classes.

@Kaj, @Henrik: what do these points mean for design? What I mean 
is that what conceptual model can I use when thinking about my design 
of REBOL  based applications?

Going back to my flash cards problem for instance, which I still 
cannot make work, if I wanted to just apply knowledge on series and 
VIEW to design this, how can I fix it (pastebin) and/or re-wrie this? 
I'm really curious to know if there is a design pattern and or way 
to go about thinking or doing REBOL coding. Thanks.

http://pastebin.com/ZEjScLyn

If you want to use objects, think in prototypes without inheritance, 
not classes

However, before objects, you should be thinking functional programming 
and data dialects

Implementing a design, you'll be doing series manipulations all the 
time

Could you also Pastebin a sample of  %temp-cards.txt so we can test 
the code to see in action what you want it do do ?

@Kaj: thanks for the update.

@DideC: sure thing. I'll pastebin a sample of the temp-cards.

http://pastebin.com/w84XhGmE

@DideC: thanks. sorry for the late reply.

todun - thanks for posting your code. You know, I never knew there 
was a "move" function. in R2.

@james_nak: I just found that out here too.

Todun, just some of my thoughts. I think you are changing the order 
of the cards ito indicate the difficulty of a question. When you 
are saving the %temp-cards.txt, you are at a particular position 
in your series because of the  "qa: next qa"  so when you save/all 
it is saving the series from the current position to the end. If 
you want to save the whole series, you can add  "head qa" which will 
bring the pointer back to the first  item for the save but leave 
your pointer at the current question.
It may help to do some simple tests:
>> a: [1 2 3 4 5 6 7 8 9 10]
== [1 2 3 4 5 6 7 8 9 10]
>> a: next a
== [2 3 4 5 6 7 8 9 10]
>> save %test.txt a
>> read %test.txt
== "2 3 4 5 6 7 8 9 10"
>> save %test.txt head a
>> read %test.txt
== "1 2 3 4 5 6 7 8 9 10"
 move/to a 5
== [6 7 8 9 10]
>> save %test.txt head a
>> read %test.txt
== "1 3 4 5 2 6 7 8 9 10"

etc. 


Also I like to add "probe" as in "probe qa" to different places in 
my code so I can see what is happening internally as I do stuff.


Finally, might I suggest that you actually approach the issue in 
a different way altogether? You can have a block that  has some metadata 
in it so that a question's difficulty can be assessed by other means 
such the word "hard" or some number such as 1 = easy and 10 = hard, 
for example. And allong with that you could keep track of how many 
times the person missed the question.
[ 1 "California"  "Sacramento"  1  1  0  1 ]

where the block above refers to  [ index Question  Answer  difficulty 
 Attempts Wrong Correct]

There's a lot more work to do this but if you can then search for 
the difficult questions, etc. Your program would control the order 
of the questions based on some filter such as difficulty, attempts. 
The user could just mark a question as difficult.

Anyway, just a thought.  I don't want to make your life hard and 
I need to go back to my own mess I started. I am in block-o-rama 
myself.

Having trouble with the "switch" function.
I'm entering the following at the REBOL terminal:
>> time: 14:00
== 14:00
>> switch/default time [
[    8:00 [send [wendy-:-domain-:-com] "Hey, get up!"]
[    12:30 [[cindy-:-dom-:-dom] "Joinme for lunch?"]
[    16:00 [send [group-:-every-:-dom] "Dinner anyone?"]
[    ]

For my trouble, I get: :)

** Script Error: switch is missing its case argument
** Near: switch/default time [
    8:00 [send [wendy-:-domain-:-com] "Hey, get up!"] 
    12:30 [[cindy-:-dom-:-dom] "Joinme for lunch?"] 
  ...


Am I using the REBOL terminal incorrectly? I'm using rebcore v 2.7.8

with the /default refinement, you need one more block, to trigger 
the default case.

for multi-line stuff, you can use the built-in very simple editor:

>> editor ""

write your script and save it and use CTRL-E (I think) to run it.

rebcore v 2.7.8

 - ok, the editor is not in this version, so you would have to use 
 another editor.

http://www.rebol.com/r3/docs/functions/switch.html

Sorry about the previous msg - still getting used to Altme :o

I'm taking the examples right from the URL in my previous msg. Is 
there a simple and bullet-proof way to enter the code at the REBOL 
console?

You should be able to somewhat safely paste multiline code, but otherwise 
it's best for single line entry. Also note that the console does 
not behave identically on different OS'es.

have you tried the 

    do read clipboard://

expression?

When developing scripts, I like to use my favourite editor and hook 
up REBOL to a keyboard shortcut, which is a nice and quick way to 
study longer REBOL scripts.

Or, if you want to examine what exactly is in the clipboard, you 
can:

    print read clipboard://

@Ladislav  nope! but I will ... :)

Is there an emacs mode for REBOL that you guys are aware of?

BTW, I just C&P the code into the console, and BINGO!!!  :))

There should be an emacs mode available. I have never used it, though.

@Henrik  What???  Are you ill? LOL ...

I don't use emacs, hence I don't need the REBOL emacs mode. :-)

@Henrik  That's my point !!  :))

Anyway ... thanks you guys!!

@Duke:  It works in the console if you put the opening bracket of 
the final block on the same line as the closing bracket of the previous 
block, like it is in the example