I love a good artifact as much as the next programmer, and this does not even require contiguous cnames. 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11112008
use warnings;
use List::Util qw( uniq );

my $aref = [
   { 'cname' => 'Smart Parking',     'balance' => 10.12, },
   { 'cname' => 'Smart Parking',     'balance' => 10.22, },
   { 'cname' => 'Smart Parking',     'balance' => 10.32, },
   { 'cname' => 'Highview Parking',  'balance' => 20.12, },
   { 'cname' => 'Highview Parking',  'balance' => 20.22, },
   { 'cname' => 'Highview Parking',  'balance' => 20.32, },
   { 'cname' => 'Highview Parking',  'balance' => 20.42, },
   { 'cname' => 'ParkingEye',        'balance' => 30.12, },
   { 'cname' => 'ParkingEye',        'balance' => 30.22, },
   ];

my %temphash;

for ( @$aref )
  {
  $temphash{$_->{cname}}{cname} = $_->{cname};
  $temphash{$_->{cname}}{balance} += $_->{balance};
  $temphash{$_->{cname}}{total}++;
  }

my $answer = [ @temphash{ uniq map $_->{cname}, @$aref } ];

use Data::Dump 'dd'; dd $answer;

[download]

In reply to Re^2: How to combine the values from hash using 'cname', along with total and balance. by tybalt89
in thread How to combine the values from hash using 'cname', along with total and balance. by Sami_R

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