How to sort the array in ruby

Question

I have a following array

arr = ["2014-05-02T19-49-55_1280x720_vga2usb.mp4", "2014-05-02T19-49-55_544x288_left_cam.mp4", "2014-05-02T19-49-55_544x288_right_cam.mp4", "2014-05-02T19-49-55_1632x288.mp4"]

I need to sort this array in a way that I get following:

["2014-05-02T19-49-55_1632x288.mp4", "2014-05-02T19-49-55_544x288_left_cam.mp4", "2014-05-02T19-49-55_544x288_right_cam.mp4", "2014-05-02T19-49-55_1280x720_vga2usb.mp4"]

I tried to use the sort method arr.sort and arr.sort_by{|word| word.downcase} But it is giving me output as

["2014-05-02T19-49-55_1280x720_vga2usb.mp4", "2014-05-02T19-49-55_1632x288.mp4", "2014-05-02T19-49-55_544x288_left_cam.mp4", "2014-05-02T19-49-55_544x288_right_cam.mp4"]

How can I do this?

Could you please close question, if answer helped you? – kasi May 09 '14 at 09:35 — kasi, May 09 '14 at 09:35

kasi · Accepted Answer · 2014-05-03T07:38:35.107

0

Try to use sort like this:

arr.sort { |x,y| y <=> x }

If you need to sort by substring try something like this:

arr.sort { |x,y| y[m,n] <=> x[m,n]}

EDIT: this should work:

arr.sort do |x,y| 
    regex = /x[[:digit:]]+(.+?)$/
    regex.match(x)[1] <=> regex.match(y)[1]
end

edited May 03 '14 at 07:38

answered May 03 '14 at 07:21

kasi

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You can shorten it to `arr.sort_by { |x| x[/x[[:digit:]]+(.+?)$/, 1] }` – Uri Agassi May 03 '14 at 13:38

How to sort the array in ruby

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