14.3 Constructing an R6 class, the basics

• Really simple to do, just use the R6::R6Class() function.

Accumulator <- R6Class("Accumulator", list(
  sum = 0,
  add = function(x = 1) {
    self$sum <- self$sum + x
    invisible(self)
  }
))

• Two important arguments:
  1. classname - A string used to name the class (not needed but suggested)
  2. public - A list of methods (functions) and fields (anything else)
• Suggested style conventions to follow:
  • Class name should follow UpperCamelCase.
  • Methods and fields should use snake_case.
  • Always assign the result of a R6Class() into a variable with the same name as the class.
• You can use self$ to access methods and fields of the current object.