using json @ ruby. from ruby best practices

Ruby: using json.rb

require "json"
hash = { "Foo" => [Math::PI, 1, "kittens"],
         "Bar" => [false, nil, true], "Baz" => { "X" => "Y" } } #...
puts hash.to_json #=> Outputs
{"Foo":[3.14159265358979,1,"kittens"],"Bar":[false,null,true],"Baz":{"X":"Y"}}


require "json"
json_string = '{"Foo":[3.14159265358979,1,"kittens"], ' +
              '"Bar":[false,null,true],"Baz":{"X":"Y"}}'
hash = JSON.parse(json_string)
p hash["Bar"] #=> Outputs
[false,nil,true]
p hash["Baz"] #=> Outputs
{ "X"=>"Y" }


require "json"
require "open-uri"
require "cgi"
module GSearch
  extend self
  API_BASE_URI =
    "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q="

  def show_results(query)
    results = response_data(query)
    results["responseData"]["results"].each do |match|
      puts CGI.unescapeHTML(match["titleNoFormatting"]) + ":\n  " + match["url"]
    end
  end

  def response_data(query)
    data = open(API_BASE_URI + URI.escape(query),
                  "Referer" => "http://rubybestpractices.com").read
    JSON.parse(data)
  end
end


require "json"
class Point
  def initialize(x,y)
    @x, @y = x, y
  end
  def distance_to(point)
    Math.hypot(point.x - x, point.y - y)
  end
  attr_reader :x, :y
  def to_json(*args)
    { 'json_class' => self.class.name,
      'data' => [@x, @y] }.to_json(*args)
  end
  def self.json_create(obj)
    new(*obj['data'])
  end
end

point_a = Point.new(1,2)
puts point_a.to_json #=> {"json_class":"Point","data":[1,2]}
point_b = JSON.parse('{"json_class":"Point","data":[4,6]}')
puts point_b.distance_to(point_a) #=> 5.0