Fun destructuring in Ruby 1.9

destr.rb

class Hash

  def with(&block)
    block.call *block.parameters.map{|x| self[x.last]}
  end

end

# Example
h = {:name => "blambeau", :hobby => "ruby"}
h.with{|hobby| puts hobby}

# Spec
require 'rspec/autorun'
describe "Hash#with" do

  it "should yield a 1-param block with the correct value" do
    {:name => "blambeau"}.with{|name|
      name.should eq("blambeau")
    }
  end

  it "should yield a 2-param block with the correct values" do
    {:name => "blambeau", :hobby => "ruby"}.with{|hobby,name|
      hobby.should eq("ruby")
      name.should eq("blambeau")
    }
  end

end