OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6. Propagating Functionality with Inheritance
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1 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Propagating Functionality with Inheritance
2 Object-Oriented Programming in R: S3 & R6
3 thing_factory <- R6Class( "Thing", private = list( a_field = "a value", another_field = 123, public = list( do_something = function(x, y, z { # do something here } Object-Oriented Programming in R: S3 & R6
4 parent the class you inherit from child the class that inherits fields and methods
5 child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory, public = list( do_something_else = function( { # more functionality }
6
7 parent a fancy microwave is a microwave is a not all microwaves are fancy microwaves child
8 > a_thing <- thing_factory$new( > class(a_thing [1] "Thing" "R6" > inherits(a_thing, "Thing" [1] TRUE > inherits(a_thing, "R6" [1] TRUE
9 > a_child_thing <- child_thing_factory$new( > class(a_child_thing [1] "ChildThing" "Thing" "R6" > inherits(a_child_thing, "ChildThing" [1] TRUE > inherits(a_child_thing, "Thing" [1] TRUE > inherits(a_child_thing, "R6" [1] TRUE
10 Summary Propagate functionality using inheritance Use the inherit arg to R6Class( Children get their parent s functionality but the converse is not true
11 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Let s practice!
12 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Embrace, Extend, Override
13 thing_factory <- R6Class( "Thing", public = list( do_something = function( { message("the parent do_something method" } Object-Oriented Programming in R: S3 & R6
14 child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory, public = list( do_something = function( { message("the child do_something method" }, do_something_else = function( { message("the child do_something_else method" }
15 > a_child_thing <- child_thing_factory$new( > a_child_thing$do_something( the child do_something method
16 private$ accesses private fields self$ accesses public methods in self super$ accesses public methods in parent
17 child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory, public = list( do_something = function( { message("the child do_something method" }, do_something_else = function( { message("the child do_something_else method" self$do_something( super$do_something( }
18 > a_child_thing <- child_thing_factory$new( > a_child_thing$do_something_else( the child do_something_else method the child do_something method the parent do_something method
19 Summary Override by giving the same name Extend by giving a new name self$ accesses public methods in self super$ accesses public methods in parent
20 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Let s practice!
21 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Multiple Levels of Inheritance
22
23 microwave fancy microwave high-end microwave
24 thing_factory <- R6Class( "Thing" child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory grand_child_thing_factory <- R6Class( "GrandChildThing", inherit = child_thing_factory
25 thing_factory <- R6Class( "Thing", public = list( do_something = function( { message("the parent do_something method" }
26 child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory, public = list( do_something = function( { message("the child do_something method" }
27 grand_child_thing_factory <- R6Class( "GrandChildThing", inherit = child_thing_factory, public = list( do_something = function( { message("the grand-child do_something method super$do_something( super$super$do_something( }
28 > a_grand_child_thing <- grand_child_thing_factory$new( > a_grand_child_thing$do_something( the grand-child do_something method the child do_something method Error in a_grand_child_thing$do_something(: attempt to apply non-function Object-Oriented Programming in R: S3 & R6
29 child_thing_factory <- R6Class( "ChildThing", inherit = thing_factory, public = list( do_something = function( { message("the child do_something method" }, active = list( super_ = function( super
30 grand_child_thing_factory <- R6Class( "GrandChildThing", inherit = child_thing_factory, public = list( do_something = function( { message("the grand-child do_something method" super$do_something( super$super_$do_something( }
31 > a_grand_child_thing <- grand_child_thing_factory$new( > a_grand_child_thing$do_something( the grand-child do_something method the child do_something method the parent do_something method Object-Oriented Programming in R: S3 & R6
32 Summary R6 objects can only access their direct parent Intermediate classes can expose their parent Use an active binding named super_ super_ should simply return super
33 OBJECT-ORIENTED PROGRAMMING IN R: S3 & R6 Let s practice!
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