From: Farrel Lifson <farrel.lifson@...>
Date: 2006-03-01T11:18:59+09:00
Subject: Hash.from_zipped_array

Hi folks,

Array has got a pretty cool method zip which 'zips' two arrays together like so:

[1,2,3].zip([2,4,6])
=> [[1,2],[2,4],[3,6]]

That's  also what you get when you call to_a on a Hash like
{1=>2,2=>4,3=>6}, so I thought why not add a method to Hash to do the
reverse, that is to construct a Hash from a zipped array?

class Hash
  def Hash.from_zipped_array(zipped_array)
    zipped_array.inject({}) do |hash,key_value_pair|
      hash[key_value_pair[0]] =key_value_pair[1]
      hash
    end
  end
end

# Example usage
animal = ["dog","cat",bird"]
sound = ["woof,"meow","cheep"]

make_a_sound_like_a = Hash.from_zipped_array(animal.zip(sound)
make_a_sound_like_a["dog"]
=>"woof"

Useful enough for inclusion?

Farrel