From: Adriano Ferreira <adrfer@...>
Date: 2010-09-30T03:40:35+09:00
Subject: The beauty of Ruby through examples

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Hey all,

I'm about to introduce Ruby to a group of people that is not familiar to the 
language, and the approach i'd like to take is simply by distilling out a few 
sample codes. I've been collecting some from around the internet, but i'd 
appreciate your suggestions as well.

I'm looking for code snippets that represent some of the beauty of Ruby 
actually, such as:

# Simplicity
# Expressiveness
# Productivity
# Flexibility
# Dynamism
# Freedom
# Happiness

Just to clear things up, here are few examples:

# Simplicity

vowels = %w(a e i o u)
alfabet = ('a'..'z').to_a
cons = alfabet - vowels
p cons

# Expressiveness

hello = 'Hello Ruby'
5.times { puts hello }

# Productivity

class Person
  # def name
  #   @name
  # end
  # 
  # def name=(other)
  #   @name = other
  # end
  # 
  # def age
  #   @age
  # end
  # 
  # def age=(other)
  #   @age = other
  # end
  
  attr_accessor :name, :age
end

john = Person.new
john.name = 'John'
john.age = 25
p john

# Flexibility

class Array
  def pick
    self[rand(self.size)]
  end
  
  alias :choose :pick
end

puts %w(1 2 3 4 5).pick
puts %w(1 2 3 4 5).choose

# Dynamism

Padawan = Class.new

class Jedi
  def train(padawan)
    def padawan.control_the_force
      puts "Now i'm ready to become a Jedi!"
    end
  end
end

skywalker = Padawan.new
yoda = Jedi.new
p skywalker.respond_to? :control_the_force  # => false

yoda.train skywalker
p skywalker.respond_to? :control_the_force  # => true
skywalker.control_the_force# => Now i'm ready to become a Jedi!


...and so on.

Any more examples?

Thanks in advance,

Adriano


      
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