Paul Kraus wrote:
>
> I think I am picking up some bad habits so maybe you guys can help.
>
> I currently use this notation @{$hash{key}} to access an array stored in
> a hash.
> I keep seeing posts that it is better to use an object like notation.
> Can I see some examples on how you would access the array or an element
> of an array.
>
> Also is there a way to access slices in a foreach something like
>
> Foreach ((@arrar)[1,3..6]){
> code
> }
Hi Paul.
By 'object-like notation' I think you mean the arrow operator?
First, be careful to forget that it's object-like at all! If $ar
is an array reference then the whole array is @{$ar} and the first
element is ${$ar}[0] or $ar->[0]. Often (like here) you can miss out
the braces, so the array is @$ar and the element is $$ar[0].
$hash{key} is an array reference, so you can do the same with that
hash element as you can with a scalar.
@{$hash{key}}; # is the array
( @$hash{key} won't work here because it's ambiguous )
and
${$hash{key}}[0]; # is the element
or
$hash{key}->[0];
Because the indirection arrow between pairs of brackets (suqare or curly)
can be removed, the last can be reduced to.
$hash{key}[0];
HTH,
Rob
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
<http://learn.perl.org/> <http://learn.perl.org/first-response>
