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Re: perl array of hashes help

by trizen (Friar)
on Apr 30, 2012 at 13:04 UTC ( #968054=note: print w/ replies, xml ) Need Help??


in reply to perl array of hashes help

my @hashes = grep { '1117' ~~ $_->{bill} } @array;

or for an older version of Perl, you can use:

use List::Util qw(first); my @hashes = grep { first { $_ eq '1117'} @{$_->{bill}} } @array;


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Re^2: perl array of hashes help
by Anonymous Monk on May 02, 2012 at 05:24 UTC
    Hi Trizen, Thanks for your help , the code is working fine, can you please explain the two codes, similar to first one when i tried like this grep { $_->{bill} =~ '1117'} @array dint worked.. so what does ~~ this mean could you please explain me clearly. regards Sridhar
      Hi Sridhar! Please take a look at the smart match operator. As you can see, 'item' ~~ \@array returns true if the 'item' exists inside the array passed as an array reference.

      Your code doesn't work because $_->{bill} is a reference to an array, so what you are actually trying is something like this: 'ARRAY(0x886b7f8)' =~ /1117/; (i.e.: return true if the left side contains the substring from the right side).

      Of course, if you're trying to match a substring inside an array, you can use: grep { qr/1117/ ~~ $_->{bill} } @array;
        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

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