Re: hash sorting/alphabetization issue : country postal codes

[grep]

in reply to hash sorting/alphabetization issue : country postal codes

Send sort the hash values not the keys.

#!/usr/bin/perl
use warnings;
use strict;

my %country_names = (
     "AF" => "Afghanistan",
     "AX" => "Aland Islands",
     "AL" => "Albania",
     "DZ" => "Algeria",
     "AS" => "American Samoa",
     "AD" => "Andorra",
     "AO" => "Angola",
     "AI" => "Anguilla",
     "AQ" => "Antarctica",
     "AG" => "Antigua And Barbuda",
     "AR" => "Argentina",
     "AM" => "Armenia",
     "AW" => "Aruba",
     "AU" => "Australia",
     "AT" => "Austria",
     "AZ" => "Azerbaijan",
     "BS" => "Bahamas",
     "BH" => "Bahrain",
     "BD" => "Bangladesh",
     "BB" => "Barbados",
     "ZZ" => "AAAAAAA"            
);

my @sorted_keys = sort { $country_names{$a} cmp $country_names{$b} } k
+eys %country_names;
print join("\n",@sorted_keys);

Comment on Re: hash sorting/alphabetization issue : country postal codes Select or Download Code
Re^2: hash sorting/alphabetization issue : country postal codes by hmbscully (Scribe) on Jul 03, 2007 at 19:59 UTC
The hash is already in alphabetical order by the values. I sorted those first thing.	[reply]
Re^3: hash sorting/alphabetization issue : country postal codes by grep (Monsignor) on Jul 03, 2007 at 20:05 UTC
Hashes are not ordered (well in any order you care about). So I don't quite know what you are referring to. but the problem is that the option items are in alphabetical order based on the country codes, not the country names. Am I not understanding what you meant by that?	[reply]
Re^2: hash sorting/alphabetization issue : country postal codes by parv (Priest) on Jul 03, 2007 at 20:24 UTC
my @sorted_keys = sort { $country_names{$a} cmp $country_names{$b} } k +eys %country_names; Considering that in the end you would have sorted VALUES not the keys, above array variable name is rather misleading. Correction. Afer grep's reply below, I saw that what was misleading was my claim made above. The array name was reasonable; it was my fault for forgetting that sort sorted the LIST based on result of BLOCK.	[reply] [d/l]
Re^3: hash sorting/alphabetization issue : country postal codes by grep (Monsignor) on Jul 03, 2007 at 21:36 UTC
Considering that in the end you would have sorted VALUES not the keys, above array variable name is rather misleading. I disagree - @sorted_keys contains SORTED KEYS, sorted by the values. But feel free to call it @keys_sorted_by_value if you feel like it.	[reply] [d/l] [select]
Re^4: hash sorting/alphabetization issue : country postal codes by parv (Priest) on Jul 04, 2007 at 04:43 UTC
Oh! Right you were, and are. Indeed the array name is reasonable and the array does contain sorted keys not the values. I apologise for distrubing the peace. I will stand in a corner now for a while ...	[reply]

In Section Seekers of Perl Wisdom

[hmbscully]

The hash is already in alphabetical order by the values. I sorted those first thing.

[grep]

Hashes are not ordered (well in any order you care about). So I don't quite know what you are referring to.

but the problem is that the option items are in alphabetical order based on the country codes, not the country names.

Am I not understanding what you meant by that?

[parv]

my @sorted_keys = sort { $country_names{$a} cmp $country_names{$b} } k
+eys %country_names;

Considering that in the end you would have sorted VALUES not the keys, above array variable name is rather misleading.

Correction. Afer grep's reply below, I saw that what was misleading was my claim made above. The array name was reasonable; it was my fault for forgetting that sort sorted the LIST based on result of BLOCK.

[grep]

Considering that in the end you would have sorted VALUES not the keys, above array variable name is rather misleading.

I disagree - @sorted_keys contains SORTED KEYS, sorted by the values.
But feel free to call it @keys_sorted_by_value if you feel like it.

[parv]

Oh! Right you were, and are. Indeed the array name is reasonable and the array does contain sorted keys not the values. I apologise for distrubing the peace.

I will stand in a corner now for a while ...