Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Re^4: perl array of hashes help

by ragilla (Initiate)
on May 07, 2013 at 04:20 UTC ( #1032435=note: print w/ replies, xml ) Need Help??


in reply to Re^3: perl array of hashes help
in thread perl array of hashes help

Hi Trizen,

I have one question regarding access of the perl hash key which is an array reference like below i have an hash

 my $all = {'text' => [                                      'HJ0039_x.pdf' , 'HJ0039' , 'HJ0039'                                      ]};

To access the above elements i can use two ways like below

 print " $all->{text}[0] ;

and

 print "${$all->{text}}[0]

can you please explain me clearly what is the difference between the above two methods , without de-referencing the array how we are able to access the array elements

Thanks


Comment on Re^4: perl array of hashes help
Select or Download Code
Re^5: perl array of hashes help
by trizen (Hermit) on May 07, 2013 at 22:41 UTC
    Hello Ragilla,

    The code $all->{text}[0] is equivalent with $all->{text}->[0]. This implies an implicit dereference. Similar with $array_ref->[0].

    In the second code, ${$all->{text}}[0] is similar with $array[0], because $all->{text} is an ARRAY REF, and @{ARRAY_REF} is similar with @array, which can lead to ${ARRAY_REF}[index].

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1032435]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (8)
As of 2015-07-03 15:44 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (53 votes), past polls