defining_equality_method.rb

# Defining equality method
# In Ruby, you can define an equality method (==) for a class to specify how instances of that class should be compared for equality. 
# This is typically done by overriding the `==` method in your class

class IceCream
  attr_reader :flavor, :scoops

  def initialize(flavor, scoops)
    @flavor = flavor
    @scoops = scoops
  end

  # Define the equality method
  def ==(other)
    # check if the other object is an instance of IceCream and compare their attributes
    # if the other object is an instance of IceCream and has the same flavor and number of scoops, we consider them equal
    if other.is_a?(IceCream) && flavor == other.flavor && scoops == other.scoops
      true
    else
      false
    end

    # alternative in one line
    # other.is_a?(IceCream) && flavor == other.flavor && scoops == other.scoops
  end
end

ice_cream1 = IceCream.new("Vanilla", 2)
ice_cream2 = IceCream.new("Vanilla", 2)
ice_cream3 = IceCream.new("Chocolate", 3)

puts ice_cream1 == ice_cream2 # Output: true (same flavor and scoops)
puts ice_cream1 == ice_cream3 # Output: false (different flavor and scoops)
puts ice_cream1 == "Not an IceCream" # Output: false (different class)