Make Methods for R6 Classes.

r6methods

Generate boilerplate code for R6 classes. Given R6 class create getters and/or setters for selected class fields or use RStudio addins to insert methods straight into class definition.

Installation

You can install development version from Github using:

remotes::install_github("jakubsob/r6methods")

Basic usage

Core functionality comes with make_methods function.

library(r6methods)
library(R6)

Person <- R6Class(
  "Person", 
  public = list(
    name = NULL,
    age = NA,
    initialize = function(name, age = NA) {
      self$name <- name
      self$age <- age
    },
    print = function(...) {
      cat("Person: \n")
      cat("  Name: ", self$name, "\n", sep = "")
      cat("  Age:  ", self$age, "\n", sep = "")
      invisible(self)
    }
  ),
  private = list(
    secret1 = NULL,
    secret2 = NULL
  )
)

Create getters and setters for private fields:

make_methods(Person, "private", "both")
#> #' @description Setter for secret1
#> set_secret1 = function(secret1) {
#>   private$secret1 <- secret1
#> },
#> #' @description Getter for secret1
#> get_secret1 = function() {
#>   private$secret1
#> },
#> #' @description Setter for secret2
#> set_secret2 = function(secret2) {
#>   private$secret2 <- secret2
#> },
#> #' @description Getter for secret2
#> get_secret2 = function() {
#>   private$secret2
#> }

Or only getters:

make_methods(Person, "private", "get", add_roxygen = FALSE)
#> get_secret1 = function() {
#>   private$secret1
#> },
#> get_secret2 = function() {
#>   private$secret2
#> }

You can also create methods for fields of your liking, not only all of private/public:

make_methods(Person, c("age", "secret1"), "get", add_roxygen = FALSE)
#> get_age = function() {
#>   self$age
#> },
#> get_secret1 = function() {
#>   private$secret1
#> }

RStudio addins

Four addins are supplied with the package. They are grouped into 2 families:

• Generate: makes method strings and prints them to console to be copied to class definition.
• Insert: makes method strings and inserts them into class definition.

Addins with gadget suffix open gadget in RStudio which allows user to have more control over the generated methods.