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Postings from August 2006
<Yobert> Hey do you know what would be cool in perl 6
<Yobert> A special variable for when you do a for (@array) style loop
<Yobert> it would always have the index of the array
Discussed on #perl6: it's already quite easy in Perl 6 to loop with an
explicit index:
my @array = <moose elk caribou>;
for @array.kv -> $i, $val {
say "$i\t$val";
}
But maybe a variable that implicitly carries along the loop index
would be even snazzier?
for @array -> $val {
say "$.\t$val";
}
(Change "$." to whatever name would actually be appropriate in this
case. "$." contains the current line number for the last filehandle
accessed in Perl 5, and that's probably why I came to think of it
here.)
Questions:
- Is the itch big enough for this? The more I look at the first piece
of code, the more I'm thinking "that's not so bad, really". (Though
opinions differed on the IRC channel.) Is there a situation I'm not
thinking of where the first piece of code would suck, and the second
piece of code would rock? Or is this a case of oversugaring?
- I feel there's a trend of moving away from line-noise variables. I'd
hate to be one to propose adding a new one to the language. Is there a
better syntax than "$."?
- How would this work with non-array data? Specifically, what happens
with next, redo etc on a filehandle, for example?
See
<http://colabti.de/irclogger/irclogger_log/perl6?date=2006-08-29,Tue&sel=145#l205>
for the #perl6 discussion.
--
masak
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