in reply to Finding size of an array in an HoA

Although I also take a reference for many situations (update: including this one :)) , your original example actually needs only braces around where an identifier name would go to work (update: at least functionally if not optimally) :
for ( 0..$#{$self->session->param('item')} ) {
    print $self->session->param('item')->[$_]."\n";
}

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Other examples (of syntax) for using such braces for this:
# to iterate the elements directly
for my $conf ( @{$self->session->param('item')} ) {
    print "$conf\n";
}

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update: this one is also not optimal for the example because of its subroutine call being repeated a few times, (as shmem has meanwhile pointed out) but there are some more common situations where the for (;;) does optimise by avoiding a generated iteration array ... I often work with large A of Hs without subroutine calls and use this approach... 
for ( my $i; $i <= $#{$self ->session->param('item') }; $i++ ) { 
    print $self -> session -> param('item') -> [$i ] . "\n";
}

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Re^2: Finding size of an array in an HoA
by shmem (Chancellor) on May 15, 2007 at 13:10 UTC
    This snippet 
    #                       typo here ------v  :-)
for ( 0..$#{$self->session->param('item'}} ) {
    print $self->session->param('item')->[$_]."\n";
}

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    means that you have as many calls to session->param as there are elements in the referenced array (apart from the first to get its last index). While impact on speed and program size is minimal, it feels somehow convoluted; taking a reference and iterating over that is cheaper and feels cleaner.

    --shmem 

    _($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}
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      Actually I agree - getting a reference from a single call to the routine is obviously better in this particular case, but I thought it was worth at least exposing the correct version of the syntax that was being attempted.
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      ^M Free your mind!

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