OpenEuphoria

Re: listed subscripting

• Posted by ags <eu at 531pi.co.nz> Apr 24, 2006
• 503 views

Antonio Alessi wrote:
> An expression like:
> }}}
<eucode>
> newString­ =
> originalString[1..2]&"INSERT"&originalString[5..9]&originalString[27..$]
> </eucode>
{{{

> could simply become:
> }}}
<eucode>
> newString­ = originalString[1..2]&"INSERT"&[5..9]&[27..$]
> </eucode>
{{{

> It should be plain to implement, I mean more useful than complicated...

I don't think that would work very well.  What if you wanted to use multiple
strings like:

newString = originalString[1..2] & "INSERT" & otherString[3..5] & [5..9]

What would the "[5..9]" refer to?

I like the idea of listed subscripts though.  It would only be useful IMHO if it
worked with predefined sequences like:

constant REPORT_FIELDS = {1,5,9,13}

sequence item

--in some for loop
    item = record[REPORT_FIELDS]

That changes the semantics codepilot originally brought up though, ie:

variable[1,5,9,13]

does not look the same as

variable[{1,5,8,13}]

and Al Getz wrote:
> I've had my share of problems like this too, where you could use
> some sort of functionality to deal with sequences easier.
> Another that comes immediately to mind is
>   {a,b,c,d}=s[1,2,3,4]

I think Rob has already made his views clear on multiple lvalue assignment and I
tend to think it would be a headache in the context of Euphoria.

What happens (even in the case of a subscript list) if the sequence s is not as
long as the subscript list?

Gary