unnu

def foo
  2.times do |i|
    puts yield
    puts "We will go here #{i}"
  end
end

foo do
  next "Next is the block's return"
  "Never returns this"

unnu

IDEA 1
(1..100).each {|i| puts [i,('foo' if i%3==0),('bar' if i%5==0)].join}

IDEA 2
(1..100).each {|i| puts "#{i}#{'foo' if i%3==0}#{'bar' if i%5==0}"}
(1..100).each{|i|puts"#{i}#{'foo'if i%3==0}#{'bar'if i%5==0}"} #shortened

unnu

class AppConfig
  instance_methods.each { |m| undef_method m unless m =~ /^__|is_a\?|empty?/ }
  
  def initialize
    @hash = Hash.new do |hash, key|
      hash[key] = AppConfig.new unless @finalized
    end
  end
  
  def method_missing(message, value = nil)

unnu

class LRUCache
  
  def initialize(size = 10)
    @size = size
    @store = {}
    @lru = []
  end
  
  def set(key, value = nil)
    value = yield if block_given?