A ruby method can accept two blocks as arguments, if we convert them to procs or lambdas

ruby-two-blocks-as-arguments.rb

#!/bin/ruby

# Inspired by http://innig.net/software/ruby/closures-in-ruby

# Can this take 2 blocks?
#  def apply_two_things(&block1, arg_after_block)
#  end
# syntax error, unexpected ',', expecting ')'

# What about 2 procs?
def apply_two_things(first, second, arg)
  second.call(first.call(arg))
end

double = proc {|x| x * 2}
plus3 = lambda{|x| x + 3}

calculated = apply_two_things(double, plus3, 5)
# returns 13
# Success !!!

puts "5 plus 3 times 2 is #{calculated}"