From: "Jan E." <lists@...>
Date: 2012-06-18T21:19:24+09:00
Subject: Re: Overwriting one Ruby array of arrays with another

Craig Law wrote in post #1064944:
> ... and it produces an array in the order that I want it but it only
> contains the keys (i.e. [1,1]). How do I include the ["X","20120617"] so
> that I get [1, 1, "X", "20120617"] in the array? I just can't figure out
> how to tack on the values associated with the keys.

Well, you've already done this with Martin's approach. The only 
difference is that "sort" has a block now, so you should probably do the 
key sorting and the mapping separately:

#------------------------------
sorted_keys = hash1.keys.sort do |(x1, y1), (x2, y2)|
  y_comparison = y2 <=> y1
  if y_comparison != 0
    y_comparison
  else
    x1 <=> x2
  end
end
result = sorted_keys.map {|key| key + hash1[key]}
#------------------------------

But I agree with Robert that you should use specific objects instead of 
hashes. The problem with your hashes is that their structure is neither 
documented (unless you write a comment) nor enforced. You may accidently 
put wrong values into the hashes and won't even notice.

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