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  3. Object-Oriented Programming with S3 and R6 in R
  • 1

    Introduction to Object-Oriented Programming

    Free

    Learn what object-oriented programming (OOP) consists of, when to use it, and what OOP systems are available in R. You'll also learn how R identifies different types of variable, using classes, types, and modes.

  • 2

    Using S3

    S3 is a very simple object-oriented system that lets you define different behavior for functions, depending upon their input argument. This chapter explains how to use S3, and how generics and methods work.

  • 3

    Using R6

    Learn how to define R6 classes, and to create R6 objects. You'll also learn about the structure of R6 classes, and how to separate the user interface from the implementation details.

  • 4

    R6 Inheritance

    Learn how to inherit from an R6 class, and how the relationship between parent and child classes works.

  • 5

    Advanced R6 Usage

    Complete your mastery of R6 by learning about advanced topics such as copying by reference, shared fields, cloning objects, and finalizing objects.

Initializing

Exercise

Specifying a Fancy Microwave Oven

Inheritance is used to propagate—that is, copy—functionality from one class to another. To create a child class from another class, use the inherit argument to R6Class() (docs).

The pattern to create a child class is:

child_class_factory <- R6Class(
  "ChildClass",
  inherit = parent_class_factory
)

Instructions

100 XP

A microwave oven class has been defined for you in the variable microwave_oven_factory.

  • Create a FancyMicrowaveOven class that inherits from MicrowaveOven.
    • Call R6Class() (docs).
    • The classname argument should be "FancyMicrowaveOven".
    • The inherit argument should be microwave_oven_factory.
    • Assign this to the variable fancy_microwave_oven_factory. Do not add any extra functionality yet.