Benchmark of different FizzBuzz implementations in Ruby

fizzbuzz.rb

require "benchmark/ips"

#####

def fizz_buzz_text(num)
  result = ''
  result += 'Fizz' if (num % 3).zero?
  result += 'Buzz' if (num % 5).zero?
  result.empty? ? num.to_s : result
end

#####

def fizz_buzz_array(num)
  result = []
  result << 'Fizz' if (num % 3).zero?
  result << 'Buzz' if (num % 5).zero?
  result.empty? ? num.to_s : result.join
end

#####

def fizz_buzz_if_else(num)
  if (num % 15) == 0
    "FizzBuzz"
  elsif (num % 5) == 0
    "Fizz"
  elsif (num % 3) == 0
    "Buzz"
  else
    num.to_s
  end
end

#####

def fizz_buzz_if_return(num)
  return "FizzBuzz" if (num % 15) == 0
  return "Fizz" if (num % 5) == 0
  return "Buzz" if (num % 3) == 0

  num.to_s
end

#####

def fizz_buzz_if_frozen(num)
  if (num % 15) == 0
    "FizzBuzz".freeze
  elsif (num % 5) == 0
    "Fizz".freeze
  elsif (num % 3) == 0
    "Buzz".freeze
  else
    num.to_s
  end
end

#####

def fizz_buzz_if_frozen_zero(num)
  if (num % 15).zero?
    "FizzBuzz".freeze
  elsif (num % 5).zero?
    "Fizz".freeze
  elsif (num % 3).zero?
    "Buzz".freeze
  else
    num.to_s
  end
end

#####

Divisable_by_fifteen = Proc.new { |i| i % 15 == 0 }
Divisable_by_three = Proc.new { |i| i % 3 == 0 }
Divisable_by_five = Proc.new { |i| i % 5 == 0 }

def fizz_buzz_case(num)
  case num
  when Divisable_by_fifteen
    "FizzBuzz"
  when Divisable_by_five
    "Fizz"
  when Divisable_by_three
    "Buzz"
  else
    num.to_s
  end
end

##### Cached

VALUES = []

def create_cache(max = 100)
  1.upto(max).each { |i| VALUES[i] = fizz_buzz_if_frozen(i) }
end

def fizz_buzz_cached(num)
  VALUES[num]
end

create_cache 100
def fizz_buzz_cached_100
  (1..100).each { |x| fizz_buzz_cached x }
end

Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)

  x.report("case") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_case x }

      i += 1
    end
  end

  x.report("if - else") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_if_else x }

      i += 1
    end
  end

  x.report("if - return") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_if_return x }

      i += 1
    end
  end

  x.report("if - frozen") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_if_frozen x }

      i += 1
    end
  end

  x.report("if - frozen - zero") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_if_frozen_zero x }

      i += 1
    end
  end


  x.report("text") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_text x }

      i += 1
    end
  end

  x.report("array") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_array x }

      i += 1
    end
  end

  x.report("cached") do |times|
    i = 0

    while i < times
      (1..100).each { |x| fizz_buzz_cached x }

      i += 1
    end
  end

  x.compare!
end