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getting keys in a hash without changing the order

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getting keys in a hash without changing the order Perl Programming forum discussing coding in Perl, utilizing Perl modules, and other Perl-related topics. Perl, the Practical Extraction and Reporting Language, is the choice for many for parsing textual information.

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  #1  
Old March 22nd, 2001, 11:34 AM
d0g1e d0g1e is offline
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When I get the keys of a hash, the keys are returned in some random order.
How can I prevent this without changing key names (to sort them alfabetically afterwards)?

Thanks in advance,
d0g1e
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Old March 26th, 2001, 03:48 PM
unobserved unobserved is offline
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hashes by their very nature keep track of their contents in a random order ..

there is no way to know which order they will return values in.
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Old March 26th, 2001, 06:41 PM
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You could take each key from the hash, "push" it into an array, the do a sort on the array to view each key alphabetically. Possibly one appoarch.

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Old March 27th, 2001, 08:20 AM
unobserved unobserved is offline
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or do it all in one line of code

Code:
@array = sort { lc($hash{$a}) cmp lc($hash{$b}) } keys %hash;
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Old March 29th, 2001, 09:50 AM
JonLed JonLed is offline
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You just need to use sort{} in your loop:
Code:
foreach $key (sort {$a cmp $b} keys %hash) {
     print $key, ': ', $hash{key}, $/;
}
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Old March 29th, 2001, 09:51 AM
JonLed JonLed is offline
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Also now that sort {$a cmp $b} will sort by the key. sort {$hash{$a} cmp $hash{$b}} will sort by the value (i think someone above misstated this)
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