Advent of Code Day 2

advent_code_day_2.rb

# PART 01
class Password
  attr_accessor :min, :max, :letter, :value

  def initialize(min:, max:, letter:, value:)
    @min = min.to_i
    @max = max.to_i
    @letter = letter
    @value = value
  end

  def valid_password?
    letters = value.scan /\w/
    count_letters = letters.select { |l| l == letter }.count
    min <= count_letters && count_letters <= max
  end

  def to_s
    "#{letter}  #{min}  #{max}  #{value}"
  end
end

contents = File.open("input.txt").read.split("\n")
passwords = []

contents.map do |item|
  key, value = item.split(':')
  quantity, letter = key.split(' ')
  passwords << Password.new(min: quantity.split('-').first, max: quantity.split('-').last, letter: letter, value: value)
end

puts "Total: #{passwords.select { |pass| pass.valid_password? }.count}"



# PART 02
class Password
  attr_accessor :min, :max, :letter, :value

  def initialize(min:, max:, letter:, value:)
    @min = min.to_i - 1
    @max = max.to_i - 1
    @letter = letter
    @value = value
  end

  def valid_password?
    letters = value.scan /\w/
    return true if letters[min] == letter && letters[max] != letter
    return true if letters[min] != letter && letters[max] == letter

    false
  end

  def to_s
    "#{letter}  #{min}  #{max}  #{value}"
  end
end

contents = File.open("input.txt").read.split("\n")
passwords = []

contents.map do |item|
  key, value = item.split(':')
  quantity, letter = key.split(' ')
  passwords << Password.new(min: quantity.split('-').first, max: quantity.split('-').last, letter: letter, value: value)
end

puts "Total: #{passwords.select { |pass| pass.valid_password? }.count}"