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> -----Original Message-----
> From: list-bounce / example.com 
> [mailto:list-bounce / example.com] On Behalf Of Analogy Analogy
> Sent: Tuesday, September 25, 2007 7:37 AM
> To: ruby-talk ML
> Subject: array manipulation
> 
> Hi Folks,
> 
> I have a general newbie type question
> Say I have a 2D array that I obtained from an external program:
> 
> array  ["a", "b", "", "c", "5"], ["d", "e", "f", "9.0", 
> "7", "g", "",
> "", ""], ["", "h", "5", "", ""]]
> 
> 
> Is there a way to remove just the last two empty strings ("") in the
> last element, so the array will look like this:
> 
> array  ["a", "b", "", "c", "5"], ["d", "e", "f", "9.0", 
> "7", "g", "",
> "", ""], ["", "h", "5"]]
> 
> I've looked at array.compact, but this removes all of the empty
> strings(""), plus I'd have to flatten the array to 1D, which 
> is no good.
> Thanks in advance!
> -- 
> Posted via http://www.ruby-forum.com/.
> 

If I understand you right and all you want to do is to remove empty strings
from the end of the last array in an array of arrays, this should suffice:

irb(main):001:0>  a  ["a", "b", "", "c", "5"], ["d", "e", "f", "9.0", "7",
"g", "", "", ""], ["", "h", "5", "", ""]]
[["a", "b", "", "c", "5"], ["d", "e", "f", "9.0", "7", "g", "", "", ""],
["", "h", "5", "", ""]]
irb(main):002:0> while a.last.last "" do
irb(main):003:1* a.last.pop
irb(main):004:1> end
nil
irb(main):005:0> a
[["a", "b", "", "c", "5"], ["d", "e", "f", "9.0", "7", "g", "", "", ""],
["", "h", "5"]]
irb(main):006:0> 

HTH,

Felix

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