Ruby Snippets

railstutorial.rb

# Ruby classes

# Class inheritance

class Word < String
  def palindrome?
    self == self.reverse
  end
end

s = Word.new("level")
puts s.length
puts s.palindrome?
puts s.class.superclass.superclass.superclass

# Modifying built-in classes

class String
  def palindrome?
    self == self.reverse
  end
end

puts "deified".palindrome?

class String
  def shuffle
    self.split("").shuffle.join
  end
end

puts "foobar".shuffle


# # Blocks
#
# (1..5).each { |i| puts i * 2 }
# 
# (1..5).each do |num|
#   puts num * 2
# end
# 
# 3.times { puts "hello world" }
# 
# (1..5).map { |i| puts i**2 }
# 
# %w[a b c].map { |char| puts char.upcase }
# 
# puts ("a".."z").to_a.shuffle[0..7].join
# 
# 
# # Hashes & Symbols
# 
# puts user = { "first_name" => "foo", "last_name" => "bar" }
# 
# user = { :name => "foobar", :email => "foobar@example.com" }
# puts user[:email]
# 
# params = {}
# params[:user] = user
# puts params[:user][:email]
# 
# flash = { :success => "it worked!", :error => "it failed." }
# flash.each do |key, value|
#   puts "key #{key.inspect} has value #{value.inspect}"
# end