Re^2: Perlplexation - foreach shoulda Known (Rosetta: Perl, Python, Ruby)

[eyepopslikeamosquito]

Is there a special variable that tracks what $i is tracking in that example?

Curiously, this is very easy in Python:

x = [ 'apple', 'banana', 'orange' ]
for i, val in enumerate(x): print i, val

which prints:

0 apple
1 banana
2 orange

and fairly easy in Ruby:

x = [ 'apple', 'banana', 'orange' ]
x.each_with_index { |val, i| print "#{i} #{val}\n" }

and I'm sure (need to wait for moritz to show me how) it's easy in Perl 6 too (probably via Array kv and/or pairs methods?).

I was hoping List::Util or List::MoreUtils might have something nice, but the best I could find is to use an iterator like so:

use List::MoreUtils qw(each_array);
my @x = ( 'apple', 'banana', 'orange' );
my $it = each_array( @{[0..$#x]}, @x );
while ( my ($i, $val) = $it->() ) {
    print "$i $val\n";
}

which is horrific. Is there a better way in List::Util or List::MoreUtils that I missed?

While I was writing this, chromatic showed how to do it in Perl 5.12 or above:

my @x = ( 'apple', 'banana', 'orange' );
while ( my ($i, $val) = each @x ) {
    print "$i $val\n";
}

[MonkOfAnotherSect]

eyepopslikeamosquito writes:

Curiously, this is very easy in Python...

And Riales's task too: remember -- slices win ;-)

for elem in some_iterable[::3]:
    do_something(elem)

Then again, I'd argue that it's really not so curious given how much iteration support/use/avoidance is baked-in (iterator and sequence protocols, generators, comprehensions, slices, etc).