fizzbuzz FP style

gistfile1.rb

def fizzbuzz_strings
  fizz = ->(number) { 'fizz' }
  buzz = ->(number) { 'buzz' }
  default = ->(number) { number.to_s }
 
  [fizz, buzz, default]
end

def fizzbuzz_rules
  multiple_of_3 = ->(number) { number % 3 == 0 }
  multiple_of_5 = ->(number) { number % 5 == 0 }
  criterias = [multiple_of_3, multiple_of_5]                                                                                                    
  default = ->(number) { not criterias.any?{|c| c.(number)} }
 
  [multiple_of_3, multiple_of_5, default]
end

def fizzbuzz_strategy
  fizzbuzz_rules.zip(fizzbuzz_strings)
end

def strings_for(number)
  fizzbuzz_strategy.select{|criteria_for, _| criteria_for.(number)}.
                    map{|_, string_for| string_for.(number)}
end
 
def fizzbuzz(number)
  strings_for(number).join
end