7 languages Ruby Day 1

day1.rb

puts "Hello, world."
("hello, Ruby".scan /\w+/).index "Ruby"
10.times{puts "my name"}
(1..10).each{|k| puts "This is sentence number #{k}"}

guess_game.rb

def start_game
  puts "Do you want to play?"
  x = gets.chomp
  if x == 'y'
    play_game rand(10) 
  elsif x == 'n'
    exit
  end
end

def play_game answer
  puts "Please enter your guess"
  evaluate_guess gets.chomp, answer
end

def evaluate_guess guess, answer
  if guess == 'quit'
    exit
  elsif guess.to_i < answer
    puts "Your guess is too low"
    play_game answer
  elsif guess.to_i > answer
    puts "Your guess is too high"
    play_game answer
  elsif guess.to_i == answer
    puts "You guessed it!"
    start_game
  else
    puts "I didn't expect that."
    exit
  end
end
  
start_game

guess_mod.rb

def start_game
  print "Do you want to play? (y/n): "
  play_game (rand(10) + 1) if gets.chomp =~ /y/
end

def play_game answer
  print "Please enter your guess: "
  evaluate_guess gets.chomp, answer
end

def evaluate_guess guess, answer
  if guess == 'quit'
    exit
  elsif guess.to_i < answer
    puts "Your guess is too low"
    play_game answer
  elsif guess.to_i > answer
    puts "Your guess is too high"
    play_game answer
  elsif guess.to_i == answer
    puts "You guessed it!"
    start_game
  end
end
  
start_game

guess_mod2.rb

def start_game
  puts "Do you want to play?"
  play_game (rand(10) + 1) if gets.chomp =~ /^(y|Y)/
end

def play_game answer
  print "Please enter your guess: "
  evaluate_guess gets.chomp, answer
end

def evaluate_guess guess, answer
  if guess == 'quit' then exit end
  guess.to_i == answer ? lambda {puts "Your guess is correct"; start_game}.call : next_try(guess.to_i, answer) 
end

def next_try guess, answer
  guess < answer ? lambda {puts "Your answer is too low!"; play_game answer}.call :  lambda {puts "Your answer is too high!"; play_game answer}.call
end

start_game

The thing that makes the regex work in the index problem is the 'scan' method, which I found here.