methods_that_take_blocks.rb

def mymethod(&blk)   #Expects a block argument
  puts "Hello from inside mymethod."
  puts "Your block returns #{blk.call}"
end

mymethod do
  puts "Hello from a block." 
  puts "I was to_proc'd and then called like a proc object." 
end

# Results:
#   Hello from inside mymethod.
#   Hello from a block.
#   I was to_proc'd and then called like a proc object.
#   Your block returns 
#   => nil 
# 
# The &parameter syntax in the method definition is 
# syntactic sugar that allows us to accept blocks.