From: Hee-Sob Park <phasis@...>
Date: 2001-03-29T18:40:05+09:00
Subject: [ruby-talk:13318] hash slice implementaion


Hi,

I'd like to use Perl's hash slice feature in Ruby.
Here is my implemetation of hash slice.
How about this code?

class Hash
  alias old_get []
  alias old_set []=
  def [](*a)
    if a.length==1
      old_get(a[0])
    else
      indexes(*a)
    end
  end
  def []=(*a)
    if a.length==2
      old_set(*a)
    else
      left = a[0...-1]
      right = a[-1]
      right = [right] if right.type != Array
      left.each_index {|x|
        old_set(left[x],right[x])
      }
    end
  end
end

h = Hash.new

h['one','two','three'] = [1,2,3]
h[1,2,3,4] = %w(a b c d)
h[*%w(a b c d)] = ['a1','a2','a3','a4']

a,b = h['a','b']
c,d = h['one','three']


Park Hee-Sob