By using reverse twice combined with grep and map you can splice out the elements you want in one fell swoop.

use strict;
use warnings;

my @array = ( 3, 13, 73, 4, 29, 38 );
print
   qq{Before:\n},
   qq{     @array\n};

my $rcExtract = sub
   {
       my $toTest = shift;
       return $toTest > 31 ? 1 : 0;
   };

my @extracted = reverse
   map  { splice @array, $_, 1 }
   grep { $rcExtract->( $array[ $_ ] ) }
   reverse 0 .. $#array;

print
   qq{After:\n},
   qq{     @array\n},
   qq{     @extracted\n};

[download]

The output.

Before:
     3 13 73 4 29 38
After:
     3 13 4 29
     73 38

[download]

I hope this is of interest.

Cheers,

JohnGG

In reply to Re: RFC: List::Extract by johngg
in thread RFC: List::Extract by lodin

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