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sort() is a builtin PERL function with three modes:
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@result = sort @array; # equivalent to sort { $a cmp $b} @array;
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which sorts the variables in @array using stringwise comparisons, returning them in @result
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@result = sort BLOCK @array; # where statement BLOCK enclosed in {} curly brackets returns -1, 0, 1 given values of $a, $b
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@result = sort { $age{$a} <=> $age{$b} } @array; # sorts by age if entries in @arrays are keys to hash %age, which holds numeric age for each key
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@result = sort SUBNAME @array; # uses subroutine (which can be specified as value of scalar variable) to perform sorting
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sub backsort { $b <=> $a; } # Reverse order for integers
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@result = sort backsort @array; # sorts in numerically decreasing order
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