Introduction to Objects and Classes

player.rb

class Person
    attr_accessor(:name, :email)

    # class variable
    @@emails = []
    @@population = 0

    def initialize(name, email)
        # instance variable
        @name = name
        @@population += 1

        puts "Created new person #{name}, population now #{Person.population}"

        if valid_email(email)
            @email = email
            @@emails << email
        end
    end

    # class method
    def self.population
        @@population
    end

    private

    def valid_email(email)
        if email != '' && !@@emails.include?(email)
            valid = true
        else
            valid = false
        end
        valid
    end
end

class Player < Person
    attr_accessor :score

    def initialize(name, email)
        @score = 0
        super(name, email)
    end
end