Just because it looked like it might be fun... 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11131585
use warnings;

my $orig = { a => { b => ["c", "d"], e => [["f"]] } };
use Data::Dump 'dd'; dd 'orig', $orig;

my $augment = { a => { b => [ 'c', 'd' ], e => [ [ 'g' ] ] } };
use Data::Dump 'dd'; dd 'augment', $augment;

my $delta = reduce( $orig, $augment );
use Data::Dump 'dd'; dd 'delta', $delta;

sub reduce
  {
  my %augment = map { $_ => '' } buildstatements( pop );
  delete @augment{ buildstatements( shift ) };
  eval join '', %augment for my $delta; # HAHAHAHAHAHA
  return $delta;
  }

my @buildcode;
sub buildstatements
  {
  @buildcode = ();
  creators( '$_->', shift() );
  return @buildcode;
  }

sub creators
  {
  my ($have, $ref) = @_;
  if( 'HASH' eq ref $ref )
    {
    creators( $have . "{$_}", $ref->{$_} ) for keys %$ref;
    }
  elsif( 'ARRAY' eq ref $ref )
    {
    creators( $have . "[$_]", $ref->[$_] ) for 0 .. $#$ref;
    }
  else { push @buildcode, qq($have = "$ref";); }
  }

[download]

Outputs: 

("orig", { a => { b => ["c", "d"], e => [["f"]] } })
("augment", { a => { b => ["c", "d"], e => [["g"]] } })
("delta", { a => { e => [["g"]] } })

[download]

Hey, it passes all the provided test cases :)

In reply to Re: Augmenting and reducing data structures by tybalt89
in thread Augmenting and reducing data structures by sciurius

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