training_bloc_proc_lambda.rb

class Test
  def run
    upload { puts "YIELD" }
  end
  def run2
    upload do 
      puts "yield with do"
    end
  end
  def run3
    a_proc = Proc.new { puts "yield from proc.new" }
    upload(&a_proc)
  end
  def run4
    upload(&method(:a_method))
  end
  def a_method
    puts "yield from a method"  
  end
  def upload(&block)
    puts "before the block"
    yield
    puts "after the block"
  end
end

Test.new.run 
Test.new.run2 
Test.new.run3 
Test.new.run4
Proc.new 



class FakeBundle
  def pass_yield(&block)
    generate(&block)
  end

  def generate
    yield('file1.mp3')
    yield('artwork.png')
  end
end

FakeBundle.new.pass_yield do |file|
  puts file
end