[REBOL] if and parens
From: laurent:giroud:libertysurf at: 5-Oct-2002 23:30
Hi everyone again,
I have a little "problem" that I encounter quite frequently with 'if : in
certain cases I need to use parens to make sure that the expression tested is
correctly evaluated.
While I understand that in some cases parens may be necessary to avoid
ambiguities, in the following example I fail to see why they are needed :
this simply prints the list of files in the current folder and works quite fine :
>> foreach elt read %. [if (get in info? to-file elt 'type) = 'file [print elt]]
...
but when removing the parens we get :
>> foreach elt read %. [if get in info? to-file elt 'type = 'file [print elt]]
** Script Error: in expected word argument of type: word
** Where: halt-view
** Near: if get in info? to-file
The code looks quite unambiguous to me since all the part beetween the 'if and
the "=" character evaluates without problem if isolated :
>> elt: %afile ; "afile" being an existing file
>> get in info? to-file elt 'type
== file
Would anyone have an explanation ?
Regards,
Laurent
--
Laurent Giroud
