how do i sort hash by key numerically

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question: ⭐ (hashes)

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Re: how do i sort hash by key numerically⭐ by arhuman (Vicar) on Mar 07, 2001 at 13:51 UTC
`for $key ( sort {$a<=>$b} keys %hash) { print "($key)->($hash{$key})\n"; }` [download]	[reply] [d/l]
Re: Answer: how do i sort hash by key numerically by arhuman (Vicar) on Mar 07, 2001 at 14:01 UTC
I've set {$a<=>$b} to show you how to change the way the list should be sorted... You could sort on : key decreasing order : {$b<=>$a} values-> {$hash{$a}<=>$hash{$b}} key length -> {length{$a}<=>length{$b}} or whatever...	[reply]
Re: how do i sort hash by key numerically by tomhukins (Curate) on Mar 07, 2001 at 14:46 UTC
Effective Perl Programming's sorting recipes explains in details how you might approach this problem.	[reply]
Re: Answer: how do i sort hash by key numerically by planetscape (Chancellor) on Oct 06, 2005 at 17:34 UTC
That link is b0rked (at least ATM). Another that might help is: Perl Sorting Techniques. HTH, planetscape	[reply]
Re: how do i sort hash by key numerically by Jouke (Curate) on Mar 07, 2001 at 13:50 UTC
This would do the trick: `#!/usr/bin/perl -w %hash=( 89=>3, 45=>2, 1 =>5, 40=>3); foreach (sort { $a <=> $b } keys(%hash) ) { print "key: $_ value: $hash{$_}\n" }` [download] Jouke Visser, Perl 'Adept'	[reply] [d/l]
Re: Answer: how do i sort hash by key numerically by Tyke (Pilgrim) on Mar 07, 2001 at 16:35 UTC
Are you sure that this doesn't sort typographically rather than numerically. I think the {$a<=>$b} block cited by arhuman is necessary here. `-- I knock my pate and fancy wit will come Knock as I please, there's no one at home a pontiff paraphrased` [download]	[reply] [d/l]
Re: how do i sort hash by key numerically by Anonymous Monk on Dec 08, 2003 at 17:03 UTC
Note that while second answer produces your test output, it does NOT sort the keys numerically. Show this by strengthening your test with another key=>val pair 100=>100 and see that 100 sorts before 40. Originally posted as a Categorized Answer.	[reply]
Re: how do i sort hash by key numerically by bose (Initiate) on Dec 03, 2014 at 06:18 UTC
hello everyone, your answer is ok,but i want to sort the above array by values.here '3' is two times then how?	[reply]
Re: Answer: how do i sort hash by key numerically by Corion (Patriarch) on Dec 03, 2014 at 07:38 UTC
See perlfaq4 on How do I sort a hash.	[reply]


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