Re: Group by from array

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11146593
use warnings;
use List::AllUtils qw( zip_by );

my %group_by;
my @titles = split ' ', <DATA>;
while( <DATA> )
  {
  my @parts = split;
  my %hash = zip_by { @_ } \@titles, \@parts;
  for ( qw( Jan Feb Mar ) )
    {
    $group_by{ join ' ', @hash{ qw( Account Entity Unit ) } }{ $_ } +=
+ $hash{ $_ };
    }
  }
use Data::Dump 'dd'; dd \%group_by;

__DATA__
Account    Entity    Unit    Jan    Feb    Mar
Account01    Entity01    Unit01    1    2    3
Account01    Entity01    Unit01    4    5    6
Account01    Entity01    Unit01    7    8    9
Account02    Entity02    Unit02    10    11    12
[download]

Outputs:

{
  "Account01 Entity01 Unit01" => { Feb => 15, Jan => 12, Mar => 18 },
  "Account02 Entity02 Unit02" => { Feb => 11, Jan => 10, Mar => 12 },
}
[download]

Comment on Re: Group by from array Select or Download Code

Replies are listed 'Best First'.
Re^2: Group by from array by LanX (Saint) on Sep 01, 2022 at 11:28 UTC
Does `my %hash = zip_by { @_ } \@titles, \@parts;` have any other effect than `my %hash; @hash{ @titles } = @parts;` ? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^3: Group by from array by choroba (Cardinal) on Sep 01, 2022 at 14:16 UTC
It's also slower. `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re^3: Group by from array by sroux (Sexton) on Sep 02, 2022 at 08:12 UTC
Thank you both for your contribution, indeed if I can avoid using a specific module that could be much better. This is what I tried below without success yet considering the following result: `{ " " => { Feb => 0, Jan => 0, Mar => 0 } }` @mapped = ("Account Entity Unit Jan Feb Mar", "Account01 Entity01 Unit01 1 2 3", "Account01 Entity01 Unit01 4 5 6", "Account01 Entity01 Unit01 7 8 9", "Account02 Entity02 Unit02 10 11 12"); my %group_by; my @titles = split ' ', @mapped; foreach (@mapped) { #print $_."\n"; my @parts = split; #print @parts."\n"; my %hash; @hash{ @titles } = @parts; #don't get it for(qw(Jan Feb Mar)){ $group_by{join ' ', @hash{qw(Account Entity Unit)}}{ $_ } +=+ +$hash{ $_ }; #don't get it either } } use Data::Dump 'dd'; dd \%group_by; [download]	[reply] [d/l] [select]
Re^4: Group by from array by tybalt89 (Monsignor) on Sep 02, 2022 at 08:25 UTC
Just some small tweaks to make it work. #!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11146593 use warnings; my @mapped = ("Account Entity Unit Jan Feb Mar", "Account01 Entity01 Unit01 1 2 3", "Account01 Entity01 Unit01 4 5 6", "Account01 Entity01 Unit01 7 8 9", "Account02 Entity02 Unit02 10 11 12"); my %group_by; my @titles = split ' ', shift @mapped; foreach (@mapped) { my %hash; @hash{ @titles } = split; #don't get it NOTE makes a h +ash with titles as keys and fields of current line as values for(qw(Jan Feb Mar)){ $group_by{join ' ', @hash{qw(Account Entity Unit)}}{ $_ } += $ +hash{ $_ }; #don't get it either NOTE does the SUM function that y +our SQL is doing } } use Data::Dump 'dd'; dd \%group_by; [download] Outputs: `{ "Account01 Entity01 Unit01" => { Feb => 15, Jan => 12, Mar => 18 }, "Account02 Entity02 Unit02" => { Feb => 11, Jan => 10, Mar => 12 }, }` [download]	[reply] [d/l] [select]
Re^5: Group by from array by tybalt89 (Monsignor) on Sep 02, 2022 at 09:06 UTC
Re^6: Group by from array by LanX (Saint) on Sep 02, 2022 at 10:34 UTC
Re^4: Group by from array by LanX (Saint) on Sep 02, 2022 at 10:42 UTC
> `@hash{ @titles } = @parts; #don't get it` That's a Hash Slice Here a little compilation with more usage examples I found in a blog: Perl 5: Hash slices can replace loops NB: the `my %hash;` doesn't need to be in the same line!!! Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]