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105 lines
4.3 KiB
105 lines
4.3 KiB
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# WDI-PANTHALASSA
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---
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Title: Ruby classes I <br>
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Type: Homework<br>
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Duration: One evening<br>
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Creator: Thom Page <br>
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Course: WDIr-Panthalassa<br>
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Competencies: Ruby classes, instance methods, inheritance<br>
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---
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## RUBY CLASSES
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#1. Classes
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Watch the short video [here](https://www.youtube.com/watch?v=r6wVziWXYWI). 6 mins 23 seconds.
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##Exercises:
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1. Create a Muppet class that takes in a `name` and puts `"This muppet is called #{name}!"` on `initialize`.
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- Assign the muppet a random color on initialize.
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2. Create a Bird class that takes in an `adjective` and a `name` and puts `"#{name} is a(n) #{adjective} bird!"` on `initialize`.
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- Assign the bird a species at random on initialize.
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#2. Instance Methods
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Watch the short video here [here](https://www.youtube.com/watch?v=c2a2bZf3LH4). 8 mins 22 seconds.
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##Exercises:
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* Add instance methods to your Muppet
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- Add a `honk` instance method to your muppet that puts `"#{name} is making a honking sound!"`. Test that it works.
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- Add a `flail` instance mthods that puts `"#{name} is flailing its arms!"`. Test that it works.
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* Add instance methods to your Bird
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- Add a `hungry` method that puts `"#{name} wants some regurgitated worms!"`. Test that it works.
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- Add a `fly` method that puts `"Flap! #{name} is taking flight!"`. Test that it works.
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4. Make your bird's `adjective` and `name` accessible. Test that this works.
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#3. Inheritance
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Watch the short video [here](https://www.youtube.com/watch?v=BJWcH8Pnafw). 6 mins 56 seconds.
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##Exercises:
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1. Create a class called `Dessert` that has instance variables of `@name` and `@sugar_content`
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2. Give it an instance method of `eat` that puts `"Yum! This #{name} is sooooo delicious!"`
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3. Make two new classes called `Pie` and `DeepFriedDessert` that inherit from `Dessert`
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4. Give the `DeepFriedDessert` its own `eat` method that instead puts `"Yum! This #{name} is sooo...ack! ugh! *heart-attack*"`
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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`
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#5. Reps with Classes
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### The Universe
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What's in a Class? Make a class called `Universe` that:
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1. Takes three parameters. These are the three things within the universe. Save these things to instance variables using an `initialize` method.
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2. Has an instance variable `@expanding = true`
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3. Has an instance variable `@conservation = true`
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4. Has a method that will print out all the things in this universe.
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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.
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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).
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7. Has a method called `whim` that changes `conservation` from `true` to `false`
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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
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item and that it has been crunched due to gravity. When the final item remains, remove that item and print "The Universe has ended."
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Test out your Universe by instantiating a `new` Universe with its parameters and running your commands.
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#3. Class Methods and 'Self'
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Watch the short video [here](https://www.youtube.com/watch?v=0r93ZhzpeqI). 8 mins 28 seconds.
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##Exercises:
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* Experiment with `self`
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- Add a class method `self.what_is_self` to your Bird class and have it put `self`.
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- Add an instance method `what_is_self` to your Bird class and have it put `self`.
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- Try calling both of these methods in Pry and see what they return.
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2. Add a class method to make puppies!
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- add an instance variable that adds a characteristic like 'playful', 'brave', 'loyal'
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- add a class method of `make_puppy` to your dog class that takes in two dogs and returns a new dog.
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- the new dog should have fur color of the first dog and the quality of the second dog.
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- make puppies!
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-----------
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#X. Ruby problems
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100 goblins
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caesar cipher
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