Understanding functional programming in Ruby.

fp.rb

# Understanding FP in Ruby

class Counter
  def initialize
    @count = 0
  end
  def call
    @count += 1
  end
end


def counter
  count = 0
  return Proc.new{ count+=1}
end

# The Class counter implements functionality of a counter using OOPS
# The method counter implements counter functionality using Functional Programming.
# Both Counter and counter implements similar functionality but uses different programming paradigm

counter1 = Counter.new
counter2 = Counter.new

counter3 = counter
counter4 = counter


counter1.call # 1
counter1.call # 2

counter2.call # 1
counter2.call # 2

counter3.call # 1
counter3.call # 2

counter4.call # 1
counter4.call # 2