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Home: Perl Programming Help: Frequently Asked Questions:
How do I sort a hash (optionally by value instead



Jan 19, 2001, 3:25 PM

Post #1 of 1 (2186 views)
How do I sort a hash (optionally by value instead Can't Post

(From the Perl FAQ)

How do I sort a hash (optionally by value instead of key)?

Internally, hashes are stored in a way that prevents you from imposing an order on key-value pairs. Instead, you have to sort a list of the keys or values:

    @keys = sort keys %hash;    # sorted by key 
@keys = sort {
$hash{$a} cmp $hash{$b}
} keys %hash; # and by value

Here we'll do a reverse numeric sort by value, and if two keys are identical, sort by length of key, and if that fails, by straight ASCII comparison of the keys (well, possibly modified by your locale -- see the perllocale manpage).

    @keys = sort { 
$hash{$b} <=> $hash{$a}
length($b) <=> length($a)
$a cmp $b
} keys %hash;


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