Episode 6 - Methods Calling Methods

Exercises

  1. Add an ‘info’ instance method to your Song class that returns a string that contains information about the song in an easy to read format.
  2. Create a new class called Product, that will produce products that are available for sale.
    • Write a constructor such that each product will have a name, a description, and a price.
    • Write methods that retrieve each of these attributes.
    • Write methods that allow us to redefine those attributes.

    Once you write the class, you should be able to run this code:
    product = Product.new("Printer", "It prints pages!", 94)
    p product
    p product.name
    product.name = "Awesome Printer"
    p product.name
    The code should output:
    #<Product:0x007fb18987bf30 @name="Printer", @description="It prints pages!", @price=94>
    "Printer"
    "Awesome Printer"
  3. Now on the Product class, add the following features.
    • Add a method called tax that returns the price multiplied by 0.09 (which will represent sales tax.) This tax method should call the price method.
    • Add a method called total which returns the sum of the price plus the tax. This method should reference both the price method as well as the tax method.