Project Euler 7

10001st_prime.rb

#Functional
require 'prime'
def find_10001_prime(array)
  # array[0] incrementor
  # array[1] number of time incremetor was prime
  prime_but_not_10001 = Prime.instance.prime?(array[0]) && array[1] != 10001
  prime_10001         = Prime.instance.prime?(array[0]) && array[1] == 10001
  
  if prime_but_not_10001
    puts "#{array} prime_but_not_10001"
    find_10001_prime([ array[0] + 1 , array[1] + 1 ])
  elsif prime_10001 
    puts "#{array[0]} 10001th Prime!"
  else
    puts "#{array[0]} not a prime Prime!"
    find_10001_prime([ array[0] + 1 , array[1] ])
  end
end

#find_10001_prime([0,0])

#Imperative
require 'prime'
i  = 0
found_primes = 0
while found_primes != 10001
  i = i +1
  if Prime.instance.prime?(i)
    found_primes = found_primes +  1
  end
end
puts i