rubylearning

01.rb

Struct.new("Point", :x, :y) #=> Struct::Point
origin = Struct::Point.new(0,0) #=> #<struct Struct::Point x=0, y=0>

02.rb

class Point < Struct.new(:x, :y)
end
origin = Point.new(0,0)

03.rb

1.9.3p194 :001 > Struct.new(:x,:y) => #<Class:0x007f8fc38da2e8>

04.rb

Point = Struct.new(:x, :y)
origin = Point.new(0,0)

05.rb

Point = Struct.new(:x, :y) do
def translate(x,y)
self.x += x
self.y += y
end
end

06.rb

origin = Point.new(0,0)
origin.translate(1,2)
puts origin #=> <struct Point x=1, y=2>

07.rb

require 'ostruct'
origin = OpenStruct.new
origin.x = 0
origin.y = 0
origin = OpenStruct.new(:x => 0, :y => 0)

08.rb

require 'ostruct'

def set_options 
  opts = OpenStruct.new
  yield opts
  opts
end

options = set_options do |o|
  o.set_foo = true
  o.load_path = "whatever:something"
end

options #=> #<OpenStruct set_foo=true, load_path="whatever:something"> 

09.rb

class Person
  attr_accessor :name, :day, :month, :year

  def initialize(opts = {})
    @name = opts[:name]
    @day = opts[:day]
    @month = opts[:month]
    @year = opts[:year]
  end

  def birthday
    "#@day/#@month/#@year"
  end
end

10.rb

$:.unshift("lib")
require 'person'

describe Person do
  it "compares birthdays" do
    joe = Person.new(:name => "Joe", :day => 5, :month => 6, :year => 1986)
    jon = Person.new(:name => "Jon", :day => 7, :month => 6, :year => 1986)

    joe.birthday.should == jon.birthday
  end
end