exercise overview

exercise.rb

# exercise is a hash
exercise = { name: 'jog', category: 'cardio', duration: 10 }
exercise.[](:name) # .[]() is a method we can call on only hashes

# exercise is an Exercise object
exercise = Exercise.new(exercise)
# exercise[:name]  CAN'T DO THIS!  exercise is not a hash anymore, so we can't call hash methods on it
# instead, we need to use the attr_reader methods to get attributes of the exercise
exercise.name # .name is a method we can call only on Exercise objects

class Exercise
  attr_reader :name # or def name; @name; end

  def initialize(exercise_data)
    @name = exercise_data[:name]
    @category = exercise_data[:category]
    @duration = exercise_data[:duration]
  end
end