procs.rb

def mymethod2(prc)
  puts "Hello from inside mymethod2."
  puts "Calling the Proc object returns #{prc.call}"
end

prc = Proc.new { puts "I'm a proc." }
mymethod2(prc)

# Outputs:
#  Hello from inside mymethod2.
#  I'm a proc.
#  Calling the Proc object returns 
#   => nil