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def ticket.venue
"Town Hall"
end
def ticket.performer
"Mark Twain"
end
def ticket.event
"Author's reading"
end
def ticket.price

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Macintosh:rubysamplecode toreystriffolino$ ruby ticket.rb
This ticket is for: ticket.rb:3:in `<main>': undefined method `event' for #<Object:0x007fcd6b04b678> (NoMethodError)

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>> ticket = Object.new
=> #<Object:0x007fcc5a849c38>
>> def ticket.venue
>>  "Town Hall"
>> end
=> nil
>> def ticket.performer
>> "Mark Twain"
>> end
=> nil

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ticket = Object.new
print "This ticket is for: "
print ticket.event + ", at"
print ticket.venue + ", on "
puts ticket.date + "."
print "The performer is "
puts ticket.performer + "."
print "the seat is "
print ticket.seat + ", "
print "and it costs $"

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NoMethodError: undefined method `talk' for #<Object:0x007ffcc9060a40>
	from (irb):2
	from /Users/toreystriffolino/.rvm/rubies/ruby-2.0.0-p247/bin/irb:13:in `<main>'

ToreySound

Seeing a language-specific explanation of OOP can make the abstract parts easier to grasp. We’ll therefore proceed to some Ruby code. We’ll create a new object. It won’t represent or model anything specific, like a house or a book or a teacher; it will be a generic object:

obj = Object.new

Now you have an object and a variable through which you can address it.

DEFINING AN OBJECT’S BEHAVIOR
Let’s say you’ve created an object and you want it to do something interesting: you want it to talk. To get it to talk, you have to ask it to talk. But before you ask it to talk, you have to teach it how to talk.
Specifically, and more technically, you have to define a method for your object. You do this using a special term—a keyword—namely, the keyword def.
Here’s how to define the method talk for the object obj:

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def obj.talk
puts "I am an object."
puts "(Do you object?)"
end

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Macintosh:rubysamplecode toreystriffolino$ irb --simple-prompt
>> obj = Object.new
=> #<Object:0x007f98d8860998>
>>

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LoadError: cannot load such file -- ./users/toreystriffolino/desktop/rubystuff/rubysamplecode/loadee
  from /Users/toreystriffolino/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /Users/toreystriffolino/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:51:in `require'
	from (irb):3
	from /Users/toreystriffolino/.rvm/rubies/ruby-2.0.0-p247/bin/irb:13:in `<main>'

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total 64
-rw-r--r--@ 1 toreystriffolino  staff   99 Oct 16 22:02 c2f.rb
-rw-r--r--@ 1 toreystriffolino  staff  165 Oct 16 22:08 c2fi.rb
-rw-r--r--@ 1 toreystriffolino  staff  202 Oct 16 23:28 c2fin.rb
-rw-r--r--  1 toreystriffolino  staff  208 Oct 19 12:54 c2fout.rb
-rw-r--r--  1 toreystriffolino  staff  105 Oct 19 12:48 loaddemo.rb
-rw-r--r--  1 toreystriffolino  staff   33 Oct 19 12:51 loadee.rb
-rw-r--r--@ 1 toreystriffolino  staff    3 Oct 16 22:45 temp.dat
-rw-r--r--  1 toreystriffolino  staff    5 Oct 19 12:57 temp.out