Ruby Day 2 Livecode - Flow, Conditionals & Arrays

acronimyze.rb

# The one we built
def acronimyzer(sentence)
  # Capitalize sentence
  caps = sentence.upcase

  # Split words
  words = caps.split

  # Pick first letter of each word
  letters = []
  words.each do |word|
    letters.push(word[0])
  end

  # Return acronym
  letters.join
end

# A one liner with a more powerful iterator: #map
# Explanation of the one line refactor:
# 1. split returns from the sentence an array of words (splits on " ", spaces)
# 2. map is a special iterator (more on this next lecture) that returns a
#    changed array based on the value of its block's iterations
#    We're taking each of the words, pick the first letter [0], and upcasing it
# 3. When the map block is closed we have an array of upcased first letters, like:
#    ["F", "A", "Q"], so we just #join them again on a string "FAQ" to close the deal
def refactored_acronimyzer(sentence)
  sentence.split.map { |word| word[0].upcase }.join
end

puts refactored_acronimyzer("Frequently Asked Questions") == "FAQ"
puts refactored_acronimyzer("oh my god") == "OMG"
puts refactored_acronimyzer("") == ""

game.rb

# Save the valid options in an array
OPTIONS_ARRAY = %w[Rock Paper Scissors]

# Asking Player option
puts "Choose your option [Rock, Paper, Scissors]"
player_option = gets.chomp.capitalize

# Check is the option is valid and keep ask if not
until OPTIONS_ARRAY.include?(player_option)
  puts "[#{player_option}] is not a valid option"
  puts "Choose your option [Rock, Paper, Scissors]"
  player_option = gets.chomp.capitalize
end

# Selecting PC option
pc_option = OPTIONS_ARRAY.sample

# Comparing Player and PC options
if player_option == pc_option
  puts "It Draw!, both you pick same same"
elsif player_option == "Rock" && pc_option == "Scissors"
  puts "PC picked #{pc_option}. Player wins!"
elsif player_option == "Paper" && pc_option == "Rock"
  puts "PC picked #{pc_option}. Player wins!"
elsif player_option == "Scissors" && pc_option == "Paper"
  puts "PC picked #{pc_option}. Player wins!"
else
  puts "PC picked #{pc_option}.PC wins!"
end