ruby example about closure

gistfile1.txt

#!/usr/bin/ruby

def get_a_closure
  this_var_is_captured = 1
  return_this_function = Proc.new do |x,y|
    puts "#{this_var_is_captured} #{x} #{y}"
  end
  return_this_function
end

def run_my_closure
  a_closure = get_a_closure()
  a_closure.call(2, 3)
  # outputs 1 2 3
  # the this_var_is_captured is still 1 despite not being "in scope" on the stack
  this_var_is_captured = 4
  a_closure.call(2, 3)
  # outputs 1 2 3
  # having a local var with the same name does not affect the closure
  # because ruby is not dynamic scope
end

if __FILE__ == $0
  run_my_closure
end