Using Schwartzian Transform here is overkill, because hash lookups are very efficient. Simplification:
my @letters = qw(
red red red blue white yellow blue navy navy green white cars );
my %count;
$count{$_}++
foreach @letters;
print("$_ => $count{$_}\n")
foreach sort { $count{$b} <=> $count{$a} } keys %count;
Output:
red => 3
blue => 2
white => 2
navy => 2
cars => 1
green => 1
yellow => 1
Kudos for being the first to sort the results, though.
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