I'm trying to get Data::Rmap to change this: 
    [
      'note',
          [
            'shopping',
            [
              'item'
            ]
          ]
        ];

[download]
to this: 
    [
          'note',
          [
            'shopping',
            [ item => 'bread' ],
            [ item => 'butter' ],
            [ item => 'beans' ],
            ]
        ];

[download]
But for some reason, it's not working out, even though I think it should per my commented code below: 
use strict;
use warnings;

use Data::Rmap qw(:all);

my $initial =
  [
    note =>
      [
    shopping =>
      [ 'item' ]
     ]
     ];

use Data::Dumper;
my ($dump) = rmap_array {
  
  # If we get an arrayref whose first element is 'shopping'
  if ($_->[0] eq 'shopping') {
    my @item;
    # build a list of shopping items
    for my $item qw(bread butter beans) {
      push @item, [ item => $item ];
    }
    # create a new array with those items
    my $newdata = [ shopping => \@item ];
    # return immediately with new data, not visiting children
    # of this array
    cut($newdata)
  } else {
    # if the arrayrefs first element is not 'shopping'
    # then simply pass it through
    $_;
  }

  } $initial ;

warn Dumper($initial, $dump);

[download]




The mantra of every experienced web application developer is the same: thou shalt separate business logic from display. Ironically, almost all template engines allow violation of this separation principle, which is the very impetus for HTML template engine development.

-- Terence Parr, "Enforcing Strict Model View Separation in Template Engines"

In reply to Data::Rmap to modify an arrayref of arrayrefs by metaperl

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