From: ara.t.howard@...
Date: 2006-03-01T11:39:57+09:00
Subject: Re: Hash.from_zipped_array

On Wed, 1 Mar 2006, Farrel Lifson wrote:

> 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

it's pretty dang easy to do already:

     harp:~ > cat a.rb
     animal, sound = %w[dog cat bird], %w[woof meow cheep]
     require 'yaml' and y Hash[*animal.zip(sound).flatten]


     harp:~ > ruby a.rb
     ---
     cat: meow
     bird: cheep
     dog: woof


kind regards.

-a

-- 
judge your success by what you had to give up in order to get it.
- h.h. the 14th dali lama