From: Jason Lillywhite <jason.lillywhite@...>
Date: 2009-10-02T04:00:22+09:00
Subject: Re: 2D array to array of hashes with repeating header

Josh Cheek wrote:
> to_convert = [[:time, :pressure],[0,2.3],[1,4.1],[2,7.56]]
> 
> header = to_convert.shift
> 
> to_convert.map! do |ary|
>   hsh = Hash.new
>   ary.each_with_index{|val,index| hsh[header[index]] = val }
>   hsh
> end
> 
> to_convert # => [{:pressure=>2.3, :time=>0}, {:pressure=>4.1, :time=>1},
> {:pressure=>7.56, :time=>2}]

Thank you. I have a question about this. I tried this and accidentally 
initialized the variable 'hsh' outside the map! method and could not get 
the correct result. I'm curious why this is wrong:

header = to_convert.shift
hsh = Hash.new
to_convert.map! do |ary|
  ary.each_with_index{|val,index| hsh[header[index]] = val }
  hsh
end

to_convert # => [{:pressure=>7.56, :time=>2}, {:pressure=>7.56, 
:time=>2}, {:pressure=>7.56, :time=>2}]

Thank you.
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