From: Rick DeNatale <rick.denatale@...>
Date: 2009-04-07T21:26:27+09:00
Subject: Re: how to sort a multi-elements array

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On Tue, Apr 7, 2009 at 12:31 AM, Christopher Dicely <cmdicely@gmail.com>wrote:

> On 4/6/09, Alexey Zilber <alexeyzilber@gmail.com> wrote:
> > 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?
>
> SortedFiles.sort_by {|date, fname| date}
> or:
> SortedFiles.sort {|record1,record2| record1[0]<=>record2[0]}
>
>
Since you are sorting on the first element of each array you can just use
SortedFiles.sort

Array comparison with another array works by using the comparison of the
first pair of elements which aren't equal, so [1,1] < [2,0] < [2,1]


-- 
Rick DeNatale

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