OpenEuphoria

Re: Last Element Reference

• Posted by jzeitlin at cloud9.net Sep 21, 2003
• 498 views

On Sat, 20 Sep 2003 21:13:44 -0700, kbochert at copper.net wrote:

>On 20 Sep 2003 at 20:35, jzeitlin at cloud9.net wrote:

 
 
>> On Sat, 20 Sep 2003 17:02:14 -0700, Al Getz <Xaxo at aol.com> wrote:
 
>> >jzeitlin at cloud9.net wrote:
 
>> [deleted for bandwidth]
  

>> Your proposal, of allowing negative subscripts without the $, requires
>> significant
>> internal programmatic change to the interpreter - 

>Sorry, no.
>   s[3..$-1]
>and
>   s[3..length(s)-1]
>and 
>   s[3..-2]
>are exactly the same thing expressed with different characters.

They mean the same thing _to_you_, who are writing programs using the
already-written
interpreter/compiler.

They are NOT, by any stretch of the imagination, the same thing
_to_the_interpreter_.
They are three different possible token-sets, which have to be processed
differently.
However, the first two forms share most of their code; in fact, the only thing
that would
be different in the processing of the first two is the need to take the extra
step of
effectively substituting "length(s)" for "$".

But see my reply to Pete Lomax.

--
Jeff Zeitlin
jzeitlin at cyburban.com