Ruby my_curry_sum demonstrating closures.

my_curry_sum.rb

def my_curry_sum x # x= number of times to curry
  sum = 0
  
  # this will not work with a proc as a proc will return
  # out of the my_curry_sum method
  sum_prc = lambda do |n|
    sum += n
    x -= 1
    return sum if x == 0
    return sum_prc 
  end
  
  return sum_prc 
end

sum = my_curry_sum(3)

p sum[1][2][3] # this is a fancy way of doing sum.call(1).call(2).call(3)