# Character Counter
class String
  def count_lcases
    count(('a'..'z').to_a.join(''))
  end
  def count_upcases
    count(('A'..'Z').to_a.join(''))
  end
  def count_num
    count((0..9).to_a.join(''))
  end
  def count_spl_chars
    length - count_lcases - count_upcases - count_num
  end
end
input = ARGV[0]
if ARGV.empty?
  puts 'Please provide an input'
  exit
end
puts 'Lowercase characters = %d' % [input.count_lcases]
puts 'Uppercase characters = %d' % [input.count_upcases]
puts 'Numeric characters = %d' % [input.count_num]
puts 'Special characters = %d' % [input.count_spl_chars]

def classify_char(c)
  case c
    when /[a-z]/ then :lcase 
    when /[A-Z]/ then :ucase
    when /\d/    then :digit
    else :other
  end
end
p "asg3456  ERTYaeth".chars.map{|c| classify_char(c) }.tally
# => {:lcase=>7, :digit=>4, :other=>2, :ucase=>4}

CHAR_CLASSES = {
  lcase: ?a..?z,
  ucase: ?A..?Z,
  digit: ?0..?9,
}
p "asg3456  ERTYaeth".each_char.with_object(Hash.new(0)) { |c, o|
  o[CHAR_CLASSES.find { |label, group| group === c }&.first || :other] += 1
}

p "asg3456  ERTYaeth".each_char.with_object(Hash.new(0)) { |c, o|
  p = CHAR_CLASSES.find { |label, group| group === c }
  o
 += 1
}