Arrays of Animals

From Exercise 34 of Learn Ruby the Hard Way.  I am sure this could be done a lot more elegantly, but I'm satisfied with what I got from this, and I know it works too.

# everything pertaining to the quiz is contained in the function below

def quiz

  # clear the screen
  puts "\e[H\e[2J"

  # gem for colorising text, very cool stuff
  require 'colorize'

  # the array of animals
  animals = ['bear', 'ruby', 'peacock', 'kangaroo', 'whale', 'platypus']

  # display the list of animals, it's not a memory test
  puts "These are the animals in our array: #{animals}"

  # preparing the ordinal and cardinal arrays for the quiz
  ordinal = ["first", "second", "third", "fourth", "fifth", "sixth"]
  cardinal = [0, 1, 2, 3, 4, 5]

  # generic question for choosing the ordinal position
  chooseOrdinal = """
  What is the ordinal position of this animal?
  first
  second
  third
  fourth
  fifth
  sixth


  """

  # generic question for choosing the cardinal position
  chooseCardinal = """
  What is the cardinal position of this animal?
  0
  1
  2
  3
  4
  5


  """

  puts """
  Type the name of an animal:
  - bear
  - ruby
  - peacock
  - kangaroo
  - whale
  - platypus

  """
  print "> "

  userSelection = $stdin.gets.chomp.downcase
  case userSelection
  when "#{animals[0]}"
    puts "You chose a #{userSelection}.\n"
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[0]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[0]}"
        puts "Correct!\n".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!".colorize(:red)
    end
  when "#{animals[1]}"
    puts "You chose a #{userSelection}."
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[1]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[1]}"
        puts "Correct!".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!"
    end
  when "#{animals[2]}"
    puts "You chose a #{userSelection}."
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[2]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[2]}"
        puts "Correct!".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!"
    end
  when "#{animals[3]}"
    puts "You chose a #{userSelection}."
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[3]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[3]}"
        puts "Correct!".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!"
    end
  when "#{animals[4]}"
    puts "You chose a #{userSelection}."
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[4]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[4]}"
        puts "Correct!".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!"
    end
  when "#{animals[5]}"
    puts "You chose a #{userSelection}."
    puts chooseOrdinal
    answerOrdinal = $stdin.gets.chomp.downcase
    if answerOrdinal == "#{ordinal[5]}"
      puts "Correct!\n".colorize(:green)
      puts chooseCardinal
    print "> "
      answerCardinal = $stdin.gets.chomp
      if answerCardinal == "#{cardinal[5]}"
        puts "Correct!".colorize(:green)
      else
        puts "Incorrect cardinal number!".colorize(:red)
      end
    else
      puts "Incorrect ordinal number!".colorize(:red)
    end
  else
    puts "I know no such animal."
  end

end

quiz()

First Small Step Into Testing

I am working on Exercise 28 of Learn Ruby the Hard Way and this is my first concrete example of using testing in the course of coding.

The exercise is a test of boolean logic: I am given a statement e.g.

true == true

And must work out whether it is "true" or "false".

As you can see, I have organised the statements in a two-dimensional array in which each sub-array is composed of three elements: a string denoting the statement, the statement itself, and my prediction.

# List of boolean statements to test my knowledge thereof, organised in a two-dimensional array
booleanTest = [
  ["true && true", true && true, true],
  ["false && true", false && true, false],
  ["1 == 1 && 2 == 1", 1 == 1 && 2 == 1, false],
  ['"test" == "test"', "test" == "test", true],
  ["1 == 1 || 2 != 1", 1 == 1 || 2 != 1, true],
  ["true && 1 == 1", true && 1 == 1, true],
  ["false && 0 != 0", false && 0 != 0, false],
  ["true || 1 == 1", true || 1 == 1, true],
  ['"test" == "testing"', "test" == "testing", false],
  ["1 != 0 && 2 == 1", 1 != 0 && 2 == 1, false],
  ['"test" != "testing"', "test" != "testing", true],
  ['"test" == 1', "test" == 1, false],
  ["!(true && false)", !(true && false), true],
  ["!(1 == 1 && 0 != 1)", !(1 == 1 && 0 != 1), false],
  ["!(10 == 1 || 1000 == 1000)", !(10 == 1 || 1000 == 1000), false],
  ["!(1 != 10 || 3 == 4)", !(1 != 10 || 3 == 4), true]
]

I test my prediction by running the following testing loop, and in keeping with the practice of "green" for good and "red" for error, I installed the colorize gem and applied it to the output of the testing loop.

# Required in order to highlight the text in the testing loop green or red.

# Colorize gem to mark the result green or red.
require 'colorize'

# Testing loop
puts "Here are the results of my test:\n\n"
booleanTest.each do|description,result,prediction|
  puts "PREDICTION: #{description} GIVES #{prediction}, RESULT: #{result}"
  if prediction == result
    puts "Correct!".colorize(:green)
  else
    puts "Incorrect!".colorize(:red)
  end
end

And here are the results: