panpsychism/unit_04/w10d03/homework/ruby_classes.md

WDI-PANTHALASSA

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Title: Ruby classes I
Type: Homework
Duration: One evening
Creator: Thom Page
Course: WDIr-Panthalassa
Competencies: Ruby classes, instance methods, inheritance

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RUBY CLASSES

#1. Classes Watch the short video here. 6 mins 23 seconds.

##Exercises:

1. Create a Muppet class that takes in a name and puts "This muppet is called #{name}!" on initialize.

• Assign the muppet a random color on initialize.

2. Create a Bird class that takes in an adjective and a name and puts "#{name} is a(n) #{adjective} bird!" on initialize.

• Assign the bird a species at random on initialize.

#2. Instance Methods Watch the short video here here. 8 mins 22 seconds.

##Exercises:

• Add instance methods to your Muppet
  • Add a honk instance method to your muppet that puts "#{name} is making a honking sound!". Test that it works.
  • Add a flail instance mthods that puts "#{name} is flailing its arms!". Test that it works.
• Add instance methods to your Bird
  • Add a hungry method that puts "#{name} wants some regurgitated worms!". Test that it works.
  • Add a fly method that puts "Flap! #{name} is taking flight!". Test that it works.

4. Make your bird's adjective and name accessible. Test that this works.

#3. Inheritance Watch the short video here. 6 mins 56 seconds.

##Exercises:

1. Create a class called Dessert that has instance variables of @name and @sugar_content
2. Give it an instance method of eat that puts "Yum! This #{name} is sooooo delicious!"
3. Make two new classes called Pie and DeepFriedDessert that inherit from Dessert
4. Give the DeepFriedDessert its own eat method that instead puts "Yum! This #{name} is sooo...ack! ugh! *heart-attack*"
5. Make a new class IceCream that inherits from Dessert use super to get the instance variables of @name and @sugar-content. Also give IceCream its own unique instance variable of @toppings

#5. Reps with Classes

The Universe

What's in a Class? Make a class called Universe that:

1. Takes three parameters. These are the three things within the universe. Save these things to instance variables using an initialize method.

2. Has an instance variable @expanding = true

3. Has an instance variable @conservation = true

4. Has a method that will print out all the things in this universe.

5. Has a method called create that takes a parameter and will add a new thing to the universe (taken from the parameter). If conservation = true then one of the three things in the universe is replaced by the new thing. If not, then a new thing is added to the others.

6. Has a method that changes expanding to false if there are more than ten things in the universe, which means the universe is now contracting . . . (there's no stable universe in this scenario).

7. Has a method called whim that changes conservation from true to false

8. Has a method called crunch wherein, if expanding equals false, removes each item from the universe (sets it to null) and prints a string saying the name of the item and that it has been crunched due to gravity. When the final item remains, remove that item and print "The Universe has ended."

Test out your Universe by instantiating a new Universe with its parameters and running your commands.

#3. Class Methods and 'Self' Watch the short video here. 8 mins 28 seconds.

##Exercises:

• Experiment with self
  • Add a class method self.what_is_self to your Bird class and have it put self.
  • Add an instance method what_is_self to your Bird class and have it put self.
  • Try calling both of these methods in Pry and see what they return.

2. Add a class method to make puppies!

• add an instance variable that adds a characteristic like 'playful', 'brave', 'loyal'
• add a class method of make_puppy to your dog class that takes in two dogs and returns a new dog.
• the new dog should have fur color of the first dog and the quality of the second dog.
• make puppies!

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#X. Ruby problems

100 goblins caesar cipher