On Wed, Oct 13, 2010 at 08:33:57AM +0200, Shlomi Fish wrote:
<snip>
> On Wednesday 13 October 2010 06:39:03 Mike McClain wrote:
> > Why do @arrays and @seconds not have the same number of elements?
> > my @arrays =
> > map
> > { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ] }
> > keys %HoAoA ;
>
> This is equivalent to:
> map { @{$HoAoA{$_} } } keys(%HoAoA);
>
> Which flattens all the arrays into one big list. It can be written better as:
> map { @$_ } values(%HoAoA);
>
Thanks I hadn't seen that.
> > my @seconds =
> > map { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ]->[1] }
> > keys %HoAoA ;
>
> That's wrong. What it does is create an array, evaluate it in scalar context
> and then trying to use it as an array refand extract the second element.
> Doing
> @{$array_re...@indices]->[$idx] is a strange construct which makes no sense.
It's right because it complies and executes with no errors.
It's only wrong because it doesn't give me what I wanted.
What I still don't understand is why it gives me what it does.
> What you want based on your comment is :
Turns out what I wanted (with thanks to merlyn) is:
my @seconds = map { $_->[1] } map { @$_ } values %HoAoA;
Mike
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