.rb

require 'benchmark'

TEN = 10
ONE_HUNDRED = 100
ONE_THOUSAND = 1000
TEN_THOUSAND = 10000
ONE_HUNDRED_THOUSAND = 100000
ONE_MILLION = 1000000
TEN_MILLION = 10000000
ONE_HUNDRED_MILLION = 100000000

def generate_ten_random_numbers
  (0...TEN).map { |generator| rand(TEN) }
end

def generate_one_hundred_random_numbers
  (0...ONE_HUNDRED).map { |generator| rand(ONE_HUNDRED) }
end

def generate_one_thousand_random_numbers
  (0...ONE_THOUSAND).map { |generator| rand(ONE_THOUSAND) }
end

def generate_ten_thousand_random_numbers
  (0...TEN_THOUSAND).map { |generator| rand(TEN_THOUSAND) }
end

def generate_one_hundred_thousand_random_numbers
  (0...ONE_HUNDRED_THOUSAND).map { |generator| rand(ONE_HUNDRED_THOUSAND) }
end

def generate_one_million_random_numbers
  (0...ONE_MILLION).map { |generator| rand(ONE_MILLION) }
end

def generate_ten_million_random_numbers
  (0...TEN_MILLION).map { |generator| rand(TEN_MILLION) }
end

def generate_one_hundred_million_random_numbers
  (0...ONE_HUNDRED_MILLION).map { |generator| rand(ONE_HUNDRED_MILLION) }
end


Benchmark.bm do |test|
  ten_random_numbers = generate_ten_random_numbers
  test.report("10 test:         ") {ten_random_numbers.sort!}
  puts "top five: #{ten_random_numbers[0..4]}\n\n"

  one_hundred_random_numbers = generate_one_hundred_random_numbers
  test.report("100 test:        ") {one_hundred_random_numbers.sort!}
  puts "top five: #{one_hundred_random_numbers[0..4]}\n\n"

  one_thousand_random_numbers = generate_one_thousand_random_numbers
  test.report("1,000 test:      ") {one_thousand_random_numbers.sort!}
  puts "top five: #{one_thousand_random_numbers[0..4]}\n\n"

  ten_thousand_random_numbers = generate_ten_thousand_random_numbers
  test.report("10,000 test:     ") {ten_thousand_random_numbers.sort!}
  puts "top five: #{ten_thousand_random_numbers[0..4]}\n\n"

  one_hundred_thousand_random_numbers = generate_one_hundred_thousand_random_numbers
  test.report("100,000 test:    ") {one_hundred_thousand_random_numbers.sort!}
  puts "top five: #{one_hundred_thousand_random_numbers[0..4]}\n\n"

  one_million_random_numbers = generate_one_million_random_numbers
  test.report("1,000,000 test:  ") {one_million_random_numbers.sort!}
  puts "top five: #{one_million_random_numbers[0..4]}\n\n"
  
  ten_million_random_numbers = generate_ten_million_random_numbers
  test.report("10,000,000 test: ") {ten_million_random_numbers.sort!}
  puts "top five: #{ten_million_random_numbers[0..4]}\n\n" 

  one_hundred_million_random_numbers = generate_one_hundred_million_random_numbers
  test.report("100,000,000 test:") {one_hundred_million_random_numbers.sort!}
  puts "top five: #{one_hundred_million_random_numbers[0..4]}\n\n" 
end