From: Alexey Zilber <alexeyzilber@...>
Date: 2009-04-07T12:29:54+09:00
Subject: Re: how to sort a multi-elements array

Hi,

  Was going through these older posts and have a similar question.  I 
have a nested array that contains a date and a filename. I'm trying to 
sort by file date.

The array is in the form:

SortedFiles = [ [200904031109, "filea.txt"], [200904031337, 
"fileb.txt"], [200904031110, "filec.xt"] ]

What I was trying to do was:

SortedFiles.sort { |[[a,b],[x,y]] a < x | }

That, unfortunately, did not work. I'm using Ruby 1.8.5 btw.  Can anyone 
help out?

Thanks,
Alex

Stefano Crocco wrote:
> On Saturday 31 May 2008, Erwin wrote:
>> aSortedArray = [ [20, "ernesto", 17], [1, "joe", 4], 5, "william", 3],
>> [2, "arthur", 2],  [28, "barbara", 2], [16, "bob", 1] ]
>>
>> any doc link where this is explained ?
>>
>> thanks a lot for your tip
> 
> You can do this:
> 
> aSortedArray = anArray.sort do |a, b|
>    if a[2] == b[2] then a[1] <=> b[1]
>    else a[2] <=> b[2]
>    end
> end
> 
> If the third element of the two subarrays are equal, then the block 
> returns
> the result of the comparison of the second elements (using <=>), 
> otherwise it
> returns the result of the comparison of the third elements, again using 
> <=>.
> 
> I hope this helps
> 
> Stefano

-- 
Posted via http://www.ruby-forum.com/.