From: John W Higgins <wishdev@...>
Date: 2009-10-31T02:17:22+09:00
Subject: Re: two stage array sorting

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Morning Tim,

On Fri, Oct 30, 2009 at 9:35 AM, Tim Ferrell <s0nspark@gmail.com> wrote:

>
> I have an array of strings like so:
>
>  Tuesday 12:00 AM
>  Sunday 9:00 AM
>  Tuesday 3:00 PM
>  Friday 7:30 AM
>  Wednesday 5:00 PM
>
> and I want the array sorted by day name and then time. Is it possible to
> do this without resorting to a two stage process? Currently I am
> breaking the array out into arrays by day and sorting those by time and
> then reassembling... it just feels dirty :-)
>
>
require 'date'

def sort_datetime_array(ary)
  fmt = '%A %I:%M %p'
  ary.sort{ |a,b|
    DateTime.strptime(a, fmt) <=> DateTime.strptime(b, fmt)
  }
end

c = ['Friday 1:00 PM', 'Tuesday 12:00 AM', 'Wednesday 3:00 PM', 'Tuesday
11:59 PM']
puts sort_datetime_array(c)

--output--
Tuesday 12:00 AM
Tuesday 11:59 PM
Wednesday 3:00 PM
Friday 1:00 PM


Just note that the original array is not sorted in this case - the method
returns a new sorted array - if you wanted the sorting done in place then
change sort to sort! in the method

John

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