yeah, i new this was tricky.
my hash keys / values have uneven names so i cant use a sort routine directly. thats
why i would like to get the key / values in the same order as they are in the
hashtable file.
whats the name of that hash modules?
:o)
martin
On Tue, Feb 26, 2002 at 10:28:16AM -0000, John Edwards wrote:
> hash keys are stored unsorted. If you have the following hash
>
> %test = ( one => 1,
> two => 2,
> three => 3);
>
> and print out the hash key/value pairs.
>
> foreach $key (keys %test) {
> print "$key is $test{$key}\n";
> }
>
> you will find they don't come out in the same order as they were stored.
>
> You can perform a sort on the keys to arrange them in order
>
> foreach $key (sort keys %test) {
> print "$key is $test{$key}\n";
> }
>
> or you can reverse the hash, making the values the keys, and sort on the new
> keys
>
> %reversed = reverse %test;
>
> foreach $key (keys %reversed) {
> print "$key is $reversed{$key}\n";
> }
>
> In doing this though, you must be aware that you will lose any data that has
> identical values. For example
>
> %test = ( one => 1,
> two => 2,
> three => 3,
> alpha => 1,
> beta => 2,
> gamma => 3);
>
> %reversed = reverse %test;
>
> foreach $key (keys %reversed) {
> print "$key is $reversed{$key}\n";
> }
>
> will print out
>
> 1 is one
> 2 is two
> 3 is three
>
> There is probably another/better way of doing this using the comparison
> operator <=>, but I don't know it. There is also a module available that
> lets you store and retrieve hashes in a fixed order.
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: 26 February 2002 09:16
> To: [EMAIL PROTECTED]
> Subject: sort order of hash keys
>
>
> hi
>
>
> i would like to know if theres a smart way to unwind a hashtable so that
> the key / value pairs comes out in the same order as they are in the table.
>
> :o)
>
> martin
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