From: Bertram Scharpf <lists@...>
Date: 2009-02-13T22:25:59+09:00
Subject: Re: How to retrive first 10 items from hash in ruby?

Hi,

Am Freitag, 13. Feb 2009, 22:02:31 +0900 schrieb David A. Black:
> On Fri, 13 Feb 2009, Bertram Scharpf wrote:
>> Am Freitag, 13. Feb 2009, 21:08:19 +0900 schrieb Dave Baldwin:
>>> On 13 Feb 2009, at 11:04, Vikas Gholap wrote:
>>>
>>>> I want to retrieve first 10 items(key value pairs) from given hash{}
>>>>
>>> ary = hashTable.sort {|a,b| -1*(a[1]<=>b[1])}
>>>
>> As ary is only of temporary use, you don't need to create another
>> array ary[0,10]. I suggest:
>>
>>  10.times { puts "Key: %s ==> %s" % e.shift }
>
> Do you mean ary.shift?

Arrgh. Of course.

The code may still be improved: Omit the multiplication by -1 in
the sort block.

  ary = hashTable.sort { |a,b| a[1]<=>b[1] }
  10.times { puts "Key: %s ==> %s" % ary.pop }

Bertram

-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de