data = <<~TEXT
  outlook	temperature	humidity	windy	play
  sunny	hot	high	FALSE	no
  sunny	hot	high	TRUE	no
  overcast	hot	high	FALSE	yes
  rainy	mild	high	FALSE	yes
  rainy	cool	normal	FALSE	yes
  rainy	cool	normal	TRUE	no
  overcast	cool	normal	TRUE	yes
  sunny	mild	high	FALSE	no
  sunny	cool	normal	FALSE	yes
  rainy	mild	normal	FALSE	yes
  sunny	mild	normal	TRUE	yes
  overcast	mild	high	TRUE	yes
  overcast	hot	normal	FALSE	yes
  rainy	mild	high	TRUE	no
TEXT
 
lines = data.lines.map(&:chomp)
headers = lines.first.split("\t")
counts = Hash.new { |h, k| h[k] = Hash.new(0) }
 
lines[1..-1].each do |line|
  values = line.split("\t")
  headers.each_with_index do |header, i|
    counts[header][values[i]] += 1
  end
end
 
counts.each do |header, values|
  puts "#{header} counts:"
  values.each do |val, count|
    puts "  #{val}: #{count}"
  end
end
 

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