[REBOL] Re: What language am I looking for?
From: joel:neely:fedex at: 15-May-2001 8:09
Hi, Ken and all,
Ken Anthony wrote:
> > In my opinion, it is ok to overwrite words...
>
> Yes it is ok, but does it put more or less burden on the
> programmer?...
>
> Here's an example of what I mean... If we change the default to no
> reassignment we could use another symbol for explicit reassignment.
>
> word: [to assign]
> word:: [to reassign]
>
> But I've always found double colons to be ugly. Any thoughts?
>
We could go the other way and tackle the problem ourselves; leave
the colon suffix as is and try something like the following (where
the "p" presumably stands for "protected" or "paranoid" or even
possibly
):
REBOL/View/Pro 1.2.0.4.2 8-May-2001
Copyright 2000-2001 REBOL Technologies. All rights reserved.
REBOL is a trademark of REBOL Technologies. WWW.REBOL.COM
Type DESKTOP or SET-USER for settings.
>> glorp: [this is a test]
== [this is a test]
>> pset: func [[catch] 'wref expr] [
[ either value? wref
[ [throw make error! "Word already set!"]
[ [set wref expr]
[ ]
>> pset glorp [this is another test]
** User Error: Word already set!
** Near: pset glorp [this is another test]
>> pset glonk [this is another test]
== [this is another test]
>> glorp
== [this is a test]
>> glonk
== [this is another test]
>>
So that PSET will only SET words that currently have no value (that
are valueless? that are clueless? Well, you know what I mean! ;-)
-jn-
--
------------------------------------------------------------
Programming languages: compact, powerful, simple ...
Pick any two!
joel'dot'neely'at'fedex'dot'com
