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<!DOCTYPE html>
<html>
<head>
<title>ruby</title>
<meta charset='utf-8'>
<meta content='width=1024, user-scalable=no' name='viewport'>
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</head>
<body class='deck-container keydown'>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h1>Some interesting things about Ruby</h1>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h2>Installation</h2>
<p><textarea class='code' display='none' mode='bash'># If you need homebrew
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

# You might need to add this line to your `~/.bashrc`:
eval "$(rbenv init -)"

brew install rbenv ruby-build
rbenv install 2.0.0-p451
rbenv global 2.0.0-p451
brew install rbenv-gem-rehash
gem install bundler</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h2>Syntax</h2>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>methods are called by default</h3>
<p><textarea class='code' display='none' mode='ruby'>def some_method
 puts 'hello'
end

some_method # => 'hello'
method(:some_method).call # => 'hello'</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>"Everything is an object"</h3>
<p><textarea class='code' display='none' mode='ruby'>3.times {|num| puts num + 1 } # => 1 # => 2 #=> 3
"foo".upcase # => 'FOO'
nil.nil?
nil.object_id #=> 8</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>query and mutating methods</h3>
<p><textarea class='code' display='none' mode='ruby'>def a_query_method?
 true
end

def mutate!
 # change something
end</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Regexp and shell literal syntax</h3>
<p><textarea class='code' display='none' mode='ruby'>/(foo|bar)/.match('foo') # => true
'foo' =~ /(foo|bar)/

`echo 'hello world'` # => 'hello world'</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>symbols</h3>
<p><textarea class='code' display='none' mode='ruby'>a_string = 'foo'
a_symbol = :foo

{ a_symbol => a_string }
{ foo: 'foo' }</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>blocks</h3>
<p><textarea class='code' display='none' mode='ruby'>def do_something
 puts 'something before'
 yield 'hi' if block_given?
 puts 'something after'
end

do_something { |something| "something in between: #{something.upcase}" }
# => 'something before'
# => 'something in between: SOMETHING'
# => 'something after'

def pass_the_block(&block)
 block
end

the_block = pass_the_block { puts "I'm the block" }
the_block.call # => I'm the block</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Procs and blocks are the same</h3>
<p><textarea class='code' display='none' mode='ruby'>times_3 = Proc.new { |num| num * 3 }
times_3.call(4) # => 12

def do_something
 puts 'something before'
 yield 4
 puts 'something after'
end

do_something(×_3) # => 12</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>symbol to proc idiom</h3>
<p><textarea class='code' display='none' mode='ruby'>[1,2,3].map(&:to_s) # => ['1', '2', '3']
[1,2,3].select(&:even?) # => [2]</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Classes are objects</h3>
<p><textarea class='code' display='none' mode='ruby'>class Foo
 def blah
 puts 'blah'
 end
end

Foo.name # => 'Foo'
Foo.methods # => [:blah]
Foo.ancestors # => [Foo, Object, Kernel, BasicObject]

bar = Class.new('Bar') do
 def bar
 puts 'bar'
 end
end

bar.name # => 'Class <id>'
Bar = bar
bar.name # => Bar</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>classes are always open</h3>
<p><textarea class='code' display='none' mode='ruby'>class Foo
 def blah
 puts 'bar'
 end
end

foo = Foo.new
foo.blah # => 'bar'

class Foo
 def blah
 puts 'baz'
 end
end

foo.blah # => 'baz'</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Instances have a 'singleton class'</h3>
<p><textarea class='code' display='none' mode='ruby'>class Foo
 def blah
 puts 'bar'
 end
end

foo = Foo.new
def foo.blah
 puts 'za'
end

foo.blah # => 'za'
Foo.new.blah # => 'bar'
foo.singleton_class.methods(true) # => [:baz]</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Class methods are defined on the singleton class</h3>
<p><textarea class='code' display='none' mode='ruby'>class Foo
 class << self
 def blah
 puts 'ha-chah-chah'
 end
 end

 def self.bar
 puts 'tarala'
 end
end

Foo.blah # => 'ha-chah-chah'
Foo.singleton_methods # => [:blah, :bar]</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h2>Culture</h2>
<ul>
<li>Based on Perl and Smalltalk</li>
<li>Ruby creator is Matz ('Matz is nice and so we are nice')</li>
<li>Rails creator is DHH ('Fuck the enterprise')</li>
<li>Like code to be 'pretty' and 'expressive'</li>
<li>Heavy emphasis on testing, lots of debates about correct way to test, TDD
versus BDD. DHH recently started a flamewar about 'TDD is Dead'</li>
</ul>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h2>Culture</h2>
<ul>
<li>A lot of people come from non-CS backgrounds, a lot of code camps these days</li>
<li>Cool to be interested in other languages, a lot of angst about what other
languages have</li>
<li>Tend to value clarity over speed</li>
<li>Like to create DSLs (see rspec below)</li>
<li>"Convention over configuration"</li>
<li>"Duck typing"</li>
</ul>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>"Convention over configuration"</h3>
<p><textarea class='code' display='none' mode='ruby'># Found in app/models/user.rb
class User < ActiveRecord::Base
end
# Maps onto users table

# Found in app/helpers/user_helper.rb
module UserHelper
 def foo
 'foo'
 end
end

# Found in app/controllers/users_controller.rb
class UsersController < ApplicationController
 def index
 end
end

# app/views/index.html.erb has access to #foo from UserHelper</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>"Duck typing"</h3>
<p><textarea class='code' display='none' mode='ruby'>class Duck
 def yell
 'quack!'
 end
end

class Goose
 def yell
 'honk!'
 end
end

def pluck_duck(duck)
 duck.yell
end

pluck_duck(Goose.new) # => 'honk!'</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h2>Libraries</h2>
<ul>
<li>Rubygems</li>
<li>Bundler</li>
<li>Rails</li>
<li>Rspec</li>
<li>Rake</li>
<li>Guard</li>
<li>Rspec</li>
<li>Cucumber</li>
</ul>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Rspec</h3>
<p><textarea class='code' display='none' mode='ruby'>class Duck
 attr_reader :name

 def initialize(name)
 @name = name
 end

 def yell
 'quack!'
 end

 def eat(food)
 food.destroy!
 end
end</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
<section class='slide'>
<div class='spacer top'></div>
<div class='content'>
<h3>Rspec</h3>
<p><textarea class='code' display='none' mode='ruby'>require 'spec_helper'

describe Duck do
 subject(:duck) { Duck.new('Donald' }

 its(:name) { should eq 'Donald' }

 it 'requires a name to be set' do
 expect { Duck.new }.to raise_exception(ArgumentError)
 end

 describe '#yell' do
 it 'makes a quacking sound when it yells' do
 duck.yell.should eq 'quack!'
 end
 end

 describe '#eat' do
 let(:food) { double }

 it 'destroys the food' do
 food.should_receive(:destroy!)
 duck.eat(food)
 end
 end
end</textarea>
</p>
</div>
<div class='spacer bottom'></div>
</section>
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