Or just keep the previous value in a variable. I'd understand "sorting by values" as walking the hash keys in the order of the values.
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
my %color_of = (
apple => 'red',
orange => 'orange',
grape => 'purple',
tomato => 'red',
lettuce => 'green',
peanut => 'tan',
);
my $previous;
for my $fruit_or_vegetable (
sort { $color_of{$a} cmp $color_of{$b} } keys %color_of
) {
say "$previous before $fruit_or_vegetable" if defined $previous;
$previous = $fruit_or_vegetable;
}
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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