ruby-hangman.rb

# She has asked you to create a method print_puzzle that prints the row of dashes for a required, single argument, word. The number of dashes or spaces should equal the amount of characters in the word. print_puzzle can also optionally take a list of characters as a second argument that represents the list of guessed letters.
# Given print_puzzle is called with the word "perimeter", your method should output:  _ _ _ _ _ _ _ _ _ 
# Given print_puzzle is called with the word "triangle" and the list of characters guessed: t,s,g, your method should output:  t _ _ _ _ g _ _

def print_puzzle(word, guessed_letters = [])
  word.chars.map {|char| guessed_letters.include?(char) ? " #{char}" : " _"}.join
end

gem 'minitest'
require 'minitest/autorun'

class TestHang < Minitest::Test

  def test_perimeter
    assert_equal " _ _ _ _ _ _ _ _ _", print_puzzle("perimeter")
  end

  def test_triangle
    assert_equal " t _ _ _ _ g _ _", print_puzzle("triangle", ['t', 's', 'g'])
  end
end