Fizz Buzz Solver

fizz_buzz_solver.rb

require 'singleton'

class FizzBuzzSolver
  include Singleton

  FIZZ = 3
  BUZZ = 5

  def run(numbers)
    answer = solve(numbers)
    answer.join("\n")
  end

  private

  def solve(numbers)
    numbers.map do |num|
      next 'fizzbuzz' if fizz?(num) && buzz?(num)
      next 'fizz' if fizz?(num)
      next 'buzz' if buzz?(num)
      next num
    end
  end

  def fizz?(num)
    (num % FIZZ).zero?
  end

  def buzz?(num)
    (num % BUZZ).zero?
  end
end

puts FizzBuzzSolver.instance.run((1..20).to_a)