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Verbally explain the following concepts:

role = "admin"

def add_admin user, role
    user.role = role
end

add_admin kyle, "user"

• What is user.role equal to? Why?
• What does it mean for a method to "return" a value?
• What's the difference between a hash and an array?
• When should you use map? Select? Reduce? Find?
• What's the difference between a class and an instance of a class?
• What's the difference between an instance method and a class method?
• What is a gem? Gemfile? Gemfile.lock?
• What is a one to many relationship? Many to many?
• How does a database relate 2 tables?
• What does "single source of truth" mean in terms of related objects?
• What is the purpose of the environment.rb file?