How do I sort hash of hashes by value using perl?
15,472
Solution 1
#!/usr/bin/perl
use strict;
use warnings;
my %hash = (
1 => { Make => 'Toyota', Color => 'Red', },
2 => { Make => 'Ford', Color => 'Blue', },
3 => { Make => 'Honda', Color => 'Yellow', },
);
# if you still need the keys...
foreach my $key ( #
sort { $hash{$a}->{Make} cmp $hash{$b}->{Make} } #
keys %hash
)
{
my $value = $hash{$key};
printf( "%s %s\n", $value->{Make}, $value->{Color} );
}
# if you don't...
foreach my $value ( #
sort { $a->{Make} cmp $b->{Make} } #
values %hash
)
{
printf( "%s %s\n", $value->{Make}, $value->{Color} );
}
Solution 2
print "$_->{Make} $_->{Color}" for
sort {
$b->{Make} cmp $a->{Make}
} values %hash;
Solution 3
plusplus is right... an array of hashrefs is likely a better choice of data structure. It's more scalable too; add more cars with push
:
my @cars = (
{ make => 'Toyota', Color => 'Red' },
{ make => 'Ford' , Color => 'Blue' },
{ make => 'Honda' , Color => 'Yellow' },
);
foreach my $car ( sort { $a->{make} cmp $b->{make} } @cars ) {
foreach my $attribute ( keys %{ $car } ) {
print $attribute, ' : ', $car->{$attribute}, "\n";
}
}
Author by
masterial
Updated on June 19, 2022Comments
-
masterial almost 2 years
I have this code
use strict; use warnings; my %hash; $hash{'1'}= {'Make' => 'Toyota','Color' => 'Red',}; $hash{'2'}= {'Make' => 'Ford','Color' => 'Blue',}; $hash{'3'}= {'Make' => 'Honda','Color' => 'Yellow',}; foreach my $key (keys %hash){ my $a = $hash{$key}{'Make'}; my $b = $hash{$key}{'Color'}; print "$a $b\n"; }
And this out put:
Toyota Red Honda Yellow Ford Blue
Need help sorting it by Make.