衝突判定

collision_detection.rb

CODE_LENGTH = 8
def generate_code
  code = SecureRandom.hex(6).hex.to_s(36)
  code = code[0, CODE_LENGTH]
  code += ('A'..'Z').to_a.sample(CODE_LENGTH - code.length).join('')

  code.upcase
end

def collision_detection(re_count)
  ary, collisions_num = [], 0

  re_count.times do
    code = generate_invited_code
    collisions_num += 1 if ary.include?(code)
    ary << code
  end

  collisions_num
end

puts collision_detection(100)