[REBOL] Re: local vars in functions
From: rotenca:telvia:it at: 1-May-2002 12:36
Hi Ladislav,
> blank-object: function [
> {make a blank object}
> set-words [block!]
> ] [object] [
> set-words: compose [return self (set-words)]
> object: do does [
> make object! set-words
> ]
> set/any in object 'self ()
> object
> ]
why not:
blank-object: function [
{make a blank object}
set-words [block!]
] [object][
unset in object: context compose [exit (set-words)] 'self
object
]
not so readable, i must admit (and 'object could be replaced by 'set-words to
make it more unreadable):
blank-object: func [
{make a blank object from a block of set-words}
blk [block!]
] [
unset in blk: context compose [exit (blk)] 'self
blk
]
> unbound?: function [
> {determines, if a word is unbound}
> word [any-word!]
> ] [err] [
> found? all [
> error? err: try [any-type? get/any :word]
> err: disarm err
> equal? err/id 'not-defined
> ]
> ]
If
equal? err/id 'not-defined
is false, the function returns false, but the status of the word is unknown,
so i think it should be better to fire an error!
---
Ciao
Romano
