From: Markus Schirp <mbj@...>
Date: 2009-05-27T17:25:53+09:00
Subject: Re: On Hashes - How the hashes printing works?

Hashes enumeration does not mirror insertion order. 
Hashes are not ordered:

http://en.wikipedia.org/wiki/Hash_table#Drawbacks

Markus


On Wed, May 27, 2009 at 05:16:57PM +0900, Neela megha shyam Chivukula wrote:
> Hi All,
> 
> I have my code as follows:-
> 
> people = {
> "torvalds"=>{"lname"=>"Torvalds", "fname"=>"Linus",
> "job"=>"maintainer"},  "matsumoto"=>{"lname"=>"Matsumoto",
> "fname"=>"Yukihiro", "job"=>"Ruby originator"},
> "litt"=>{"lname"=>"Litt", "fname"=>"Steve", "job"=>"troubleshooter"}
> }
> keys = people.keys
> for key in 0...keys.length
> print "key  : ", keys[key], "\n"
> print "lname: ", people[keys[key]]["lname"], "\n"
> print "fname: ", people[keys[key]]["fname"], "\n"
> print "job  : ", people[keys[key]]["job"], "\n"
> print "\n\n"
> end
> 
> O/p:-
> key  : litt
> lname: Litt
> fname: Steve
> job  : troubleshooter
> key  : matsumoto
> lname: Matsumoto
> fname: Yukihiro
> job  : Ruby originator
> key  : torvalds
> lname: Torvalds
> fname: Linus
> job  : maintainer
> 
> Question:-
> Why key of "litt" is printed first thought the first key of hash is
> "torvalds"?
> 
> Thanks and regards,
> Neela.
> -- 
> Posted via http://www.ruby-forum.com/.