learn-co-curriculum / mod-1-discussion-questions-object-orientation-in-ruby

Week 1, Day 2 Morning Discussion Questions

Instructions

Take 30 minutes and answer the following questions together with your group. Take turns playing around with the code provided in Pry or IRB.

Questions

1 . If the Animal class is defined like this:

class Animal

  def species
    "cat"
  end

end

How would you:

1. Make a new instance of `Animal`?
2. `puts` out to the terminal, the species of that new `Animal` instance?

2 . Although we all know that cats are the best species, not all animals are cats (unfortunately). How could you change the Animal class so that an instance of animal can have its species set to any species at all?

3 . We have the following class, and the following two instances of that class:

class Animal

  def species
    "cat"
  end
end

maru = Animal.new
hanna = Animal.new

Given the above, what will the following return? Why?

maru == hanna

4 . Given the following class:

class Animal
  
  def species 
    my_species = "cat"
  end

  def say_species
    puts "Hi! I'm a #{my_species}"
  end
end

What will happen when we invoke the following code?

maru = Animal.new
maru.say_species

Is it broken? Why? How can you fix it?

5 . Reverse engineer this code (i.e., write the class that will make the code work as invoked below):

frederick = Animal.new("bull")
frederick.species
# => "bull"

Hint: How can you instantiate, or initialize, an instance of a class with a given value? What kind of variable would you use so that that value can be shared across instance methods within a class?

6 . Given the following code:

class Animal
  
  def initialize(species)
    @species = species
  end

end

lil_bub = Animal.new("cat")

What is the relationship between lil_bub and the Animal class?

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