[REBOL] Re: Submitted, for your approval.
From: carl:cybercraft at: 28-May-2002 20:23
Hi Ed,
On 28-May-02, Ed Dana wrote:
>> If Begin [
>> Symbol_Set: [ "~" "!" "@" "#" "$" "%" "&" "*" ]
>> Random/seed Now
>> ]
>> to...
>> Begin: does [
>> Symbol_Set: [ "~" "!" "@" "#" "$" "%" "&" "*" ]
>> Random/seed Now
>> ]
> It was a good excursive in using refinements and testing the
> document functionality that is built in to REBOL.
>> and you can then call that with just "Begin" instead of
>> "Symbols/Begin". ('does is for functions without any arguments.)
> Yes, I thought about that, but noticed that there was no way to
> prefix the subroutine with the parent one, at least not that I could
> see. But then, I'm only on Chapter 7 of the official guide. :)
Well, you wouldn't have to prefix it if calling it from within the
main function, or from outside for that matter if you hadn't made the
internal functions local.
> My preferred style would have been to call the subroutine as
> Symbol.Begin. Which is one of the reasons I settled for using
> refinements.
My approach would be something like this...
symbol: func [
"Demo function"
/local begin this that and-the-other
][
begin: does [
print "Beginning..."
this that and-the-other
]
this: does [print "this..."]
that: does [print "that..."]
and-the-other: does [print "and that's all folks!"]
begin ; Here's where the program starts doing something...
print "The End."
]
That at the console gives...
>> ? symbol
USAGE:
SYMBOL
DESCRIPTION:
Demo function
SYMBOL is a function value.
And...
>> symbol
Beginning...
this...
that...
and that's all folks!
The End.
Perhaps more in keeping with your style though would be to make it an
object...
symbol: make object! [
help: does [print "Demo object."]
begin: does [
print "Beginning..."
this that and-the-other end
]
this: does [print "this..."]
that: does [print "that..."]
and-the-other: does [print "and that's all folks!"]
end: does [print "The End."]
]
Usage for that is...
>> symbol/help
Demo object.
>> symbol/begin
Beginning...
this...
that...
and that's all folks!
The End.
and as with symbol/help and beginyou can access all the other
functions within 'symbol...
>> symbol/this
this...
but the functions themselves don't need the prefix to call eachother -
see 'begin.
Hmmm. I hope that's enlightened you and not just confused you. (: As
you'll gather, REBOL's quite flexible. Not to mention fun. (;
--
Carl Read
