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Learning to Program in Ruby: By Example

Ask for More Letters

Learn how to use the loops and nested statements in Ruby.

We'll cover the following...

We are going to extend the game also to do the following:

  • Ask for a letter.
  • Give feedback on the proposal.
  • Ask for a letter again.
  • Repeat these steps until the player enters the word “stop.”
Ruby
hidden_word = "hello"
puts "_ _ _ _ _"
puts
loop do
  print "Give me a letter: "
  answer = gets
  answer = answer.chomp.downcase
  if answer == 'stop'
    exit
  end
  if answer.length > 1
    puts "You must give only one letter!"
  elsif hidden_word.include?(answer)
    puts "The letter is part of the hidden word"
  else
    puts "Invalid letter"
  end
end

Loop implementation

We added loop do at line 6 and end at line 25.

The do and end words, recognized by Ruby, surround a sequence of instructions called a block. The effect of the loop word is to repeat the execution of all the instructions inside the block, without ever stopping. The following diagram shows a simple snippet of code that would indefinitely display hello.

The arrows show that the block starts from the do word and lasts till the end word. It ...