The easiest way is to just push a reference to an anon hash onto the @files array as shown below...

#!/usr/bin/perl -w
use strict;
use File::Find;
use Data::Dumper;

my @files = ();  #will be an Array of Hashes
my $odd =1;

sub filer
{
    my $filepath_rs = $File::Find::name;
    return unless -f $filepath_rs;
  
    push(@files, {file=>$filepath_rs, OddEven => $odd}); 
    $odd ^= 1;
}

find(\&filer, 'C:/temp');

print Dumper \@files;
[download]

This does the same thing:

#!/usr/bin/perl -w
use strict;
use File::Find;
use Data::Dumper;

my @files = ();  #will be an Array of Hashes
my $odd =1;

sub filer
{
    my $filepath_rs = $File::Find::name;
    return unless -f $filepath_rs;
    
    my %metadata;
    $metadata{file} = $filepath_rs;
    $metadata{OddEven} = $odd;
  
    push(@files, \%metadata); 
    $odd ^= 1;
}

find(\&filer, 'C:/temp');

print Dumper \@files;
[download]

Every time the subroutine filer is entered a new hash %metadata is created. If a reference to some previously created %metadata hash exists, then new memory is allocated for this instance of %metadata. If %metadata is a multi-dimensional hash, the same rules apply and a complete new hash and memory allocation will be made.

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